# 139 (number)

 ← 138 139 140 →
Cardinal one hundred thirty-nine
Ordinal 139th
(one hundred and thirty-ninth)
Factorization prime
Prime 34th
Divisors 1, 139
Roman numeral CXXXIX
Binary 100010112
Ternary 120113
Quaternary 20234
Quinary 10245
Senary 3516
Octal 2138
Duodecimal B712
Vigesimal 6J20
Base 36 3V36

139 (One hundred [and] thirty-nine) is the natural number following 138 and preceding 140.

## In mathematics

139 is the 34th prime number. It is a twin prime with 137. Because 141 is a semiprime, 139 is a Chen prime. 139 is the smallest prime before a prime gap of length 10.[1]

This number is the sum of five consecutive prime numbers (19 + 23 + 29 + 31 + 37).

It is the smallest factor of 64079. It is also the smallest factor of the first nine terms of the Euclid–Mullin sequence, making it the tenth term.

139 is a happy number[2] and a strictly non-palindromic number.[3]

139 is also:

## References

1. Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 139
2. "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
3. "Sloane's A016038 : Strictly non-palindromic numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.