400866456 has 32 divisors (see below), whose sum is σ = 1034496000. Its totient is φ = 129311520.

The previous prime is 400866397. The next prime is 400866463. The reversal of 400866456 is 654668004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268656 + ... + 270143.

It is an arithmetic number, because the mean of its divisors is an integer number (32328000).

Almost surely, 2^400866456 is an apocalyptic number.

It is an amenable number.

400866456 is an abundant number, since it is smaller than the sum of its proper divisors (633629544).

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

400866456 is a wasteful number, since it uses less digits than its factorization.

400866456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538839 (or 538835 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 400866456 is about 20021.6496822814. The cubic root of 400866456 is about 737.3379245874.

The spelling of 400866456 in words is "four hundred million, eight hundred sixty-six thousand, four hundred fifty-six".