423257656 has 32 divisors (see below), whose sum is σ = 804610800. Its totient is φ = 208707840.

The previous prime is 423257651. The next prime is 423257683. The reversal of 423257656 is 656752324.

It is a super-2 number, since 2×423257656² = 358294086725228672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423257651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521491 + ... + 522301.

Almost surely, 2^423257656 is an apocalyptic number.

It is an amenable number.

423257656 is a deficient number, since it is larger than the sum of its proper divisors (381353144).

423257656 is a wasteful number, since it uses less digits than its factorization.

423257656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1635 counting only the distinct ones).

The product of its digits is 302400, while the sum is 40.

The square root of 423257656 is about 20573.2266793520. The cubic root of 423257656 is about 750.8184582137.

The spelling of 423257656 in words is "four hundred twenty-three million, two hundred fifty-seven thousand, six hundred fifty-six".