40013656 has 8 divisors (see below), whose sum is σ = 75025620. Its totient is φ = 20006824.

The previous prime is 40013647. The next prime is 40013657. The reversal of 40013656 is 65631004.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 40013656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40013657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500846 + ... + 2500861.

Almost surely, 2^40013656 is an apocalyptic number.

It is an amenable number.

40013656 is a deficient number, since it is larger than the sum of its proper divisors (35011964).

40013656 is a wasteful number, since it uses less digits than its factorization.

40013656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001713 (or 5001709 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 40013656 is about 6325.6348298017. The cubic root of 40013656 is about 342.0341039597.

The spelling of 40013656 in words is "forty million, thirteen thousand, six hundred fifty-six".