69400639 has 12 divisors (see below), whose sum is σ = 87182032. Its totient is φ = 54077760.

The previous prime is 69400633. The next prime is 69400651. The reversal of 69400639 is 93600496.

It is not a de Polignac number, because 69400639 - 2⁵ = 69400607 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 69400598 and 69400607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69400633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40122 + ... + 41815.

Almost surely, 2^69400639 is an apocalyptic number.

69400639 is a deficient number, since it is larger than the sum of its proper divisors (17781393).

69400639 is a wasteful number, since it uses less digits than its factorization.

69400639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81966 (or 81955 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 69400639 is about 8330.7045920498. The cubic root of 69400639 is about 410.9489007299.

The spelling of 69400639 in words is "sixty-nine million, four hundred thousand, six hundred thirty-nine".