69138929 has 16 divisors (see below), whose sum is σ = 75816000. Its totient is φ = 62798400.

The previous prime is 69138919. The next prime is 69138947. The reversal of 69138929 is 92983196.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69138929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (69138919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98279 + ... + 98979.

It is an arithmetic number, because the mean of its divisors is an integer number (4738500).

Almost surely, 2^69138929 is an apocalyptic number.

It is an amenable number.

69138929 is a deficient number, since it is larger than the sum of its proper divisors (6677071).

69138929 is a wasteful number, since it uses less digits than its factorization.

69138929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928.

The product of its digits is 209952, while the sum is 47.

The square root of 69138929 is about 8314.9822008228. The cubic root of 69138929 is about 410.4316869019.

The spelling of 69138929 in words is "sixty-nine million, one hundred thirty-eight thousand, nine hundred twenty-nine".