129837139 has 4 divisors (see below), whose sum is σ = 135482256. Its totient is φ = 124192024.

The previous prime is 129837137. The next prime is 129837157. The reversal of 129837139 is 931738921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129837139 - 2¹ = 129837137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129837095 and 129837104.

It is not an unprimeable number, because it can be changed into a prime (129837131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2822524 + ... + 2822569.

It is an arithmetic number, because the mean of its divisors is an integer number (33870564).

Almost surely, 2^129837139 is an apocalyptic number.

129837139 is a deficient number, since it is larger than the sum of its proper divisors (5645117).

129837139 is an equidigital number, since it uses as much as digits as its factorization.

129837139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5645116.

The product of its digits is 81648, while the sum is 43.

The square root of 129837139 is about 11394.6100854746. The cubic root of 129837139 is about 506.3680697227.

The spelling of 129837139 in words is "one hundred twenty-nine million, eight hundred thirty-seven thousand, one hundred thirty-nine".