129813839 has 8 divisors (see below), whose sum is σ = 131521488. Its totient is φ = 128113920.

The previous prime is 129813829. The next prime is 129813841. The reversal of 129813839 is 938318921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129813839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129813839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129813829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36824 + ... + 40194.

It is an arithmetic number, because the mean of its divisors is an integer number (16440186).

Almost surely, 2^129813839 is an apocalyptic number.

129813839 is a deficient number, since it is larger than the sum of its proper divisors (1707649).

129813839 is an equidigital number, since it uses as much as digits as its factorization.

129813839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865.

The product of its digits is 93312, while the sum is 44.

The square root of 129813839 is about 11393.5876263800. The cubic root of 129813839 is about 506.3377777176.

The spelling of 129813839 in words is "one hundred twenty-nine million, eight hundred thirteen thousand, eight hundred thirty-nine".