400656432 has 40 divisors (see below), whose sum is σ = 1129124160. Its totient is φ = 121410880.

The previous prime is 400656407. The next prime is 400656437. The reversal of 400656432 is 234656004.

It is a self number, because there is not a number n which added to its sum of digits gives 400656432.

It is not an unprimeable number, because it can be changed into a prime (400656437) 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, 378882 + ... + 379937.

It is an arithmetic number, because the mean of its divisors is an integer number (28228104).

Almost surely, 2^400656432 is an apocalyptic number.

It is an amenable number.

400656432 is an abundant number, since it is smaller than the sum of its proper divisors (728467728).

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

400656432 is a wasteful number, since it uses less digits than its factorization.

400656432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758841 (or 758835 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 400656432 is about 20016.4040726600. The cubic root of 400656432 is about 737.2091321424.

The spelling of 400656432 in words is "four hundred million, six hundred fifty-six thousand, four hundred thirty-two".