400909256 has 64 divisors (see below), whose sum is σ = 838252800. Its totient is φ = 178235200.

The previous prime is 400909247. The next prime is 400909273. The reversal of 400909256 is 652909004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 956615 + ... + 957033.

It is an arithmetic number, because the mean of its divisors is an integer number (13097700).

Almost surely, 2^400909256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400909256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419126400).

400909256 is an abundant number, since it is smaller than the sum of its proper divisors (437343544).

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

400909256 is a wasteful number, since it uses less digits than its factorization.

400909256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 400909256 is about 20022.7184967476. The cubic root of 400909256 is about 737.3641651966.

The spelling of 400909256 in words is "four hundred million, nine hundred nine thousand, two hundred fifty-six".