40000656 has 20 divisors (see below), whose sum is σ = 103335152. Its totient is φ = 13333536.

The previous prime is 40000651. The next prime is 40000669. The reversal of 40000656 is 65600004.

40000656 is a modest number, since divided by 656 gives 400 as remainder.

It is not an unprimeable number, because it can be changed into a prime (40000651) 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, 416626 + ... + 416721.

Almost surely, 2^40000656 is an apocalyptic number.

It is an amenable number.

40000656 is an abundant number, since it is smaller than the sum of its proper divisors (63334496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40000656 is a wasteful number, since it uses less digits than its factorization.

40000656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833358 (or 833352 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 40000656 is about 6324.6071814778. The cubic root of 40000656 is about 341.9970588988.

The spelling of 40000656 in words is "forty million, six hundred fifty-six", and thus it is an aban number.