40405656 has 64 divisors (see below), whose sum is σ = 103795200. Its totient is φ = 13104000.

The previous prime is 40405639. The next prime is 40405657. The reversal of 40405656 is 65650404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405657) 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, 191391 + ... + 191601.

It is an arithmetic number, because the mean of its divisors is an integer number (1621800).

Almost surely, 2^40405656 is an apocalyptic number.

It is an amenable number.

40405656 is an abundant number, since it is smaller than the sum of its proper divisors (63389544).

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

40405656 is a wasteful number, since it uses less digits than its factorization.

40405656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 40405656 is about 6356.5443442172. The cubic root of 40405656 is about 343.1474063755.

The spelling of 40405656 in words is "forty million, four hundred five thousand, six hundred fifty-six".