400451912 has 24 divisors (see below), whose sum is σ = 873435510. Its totient is φ = 171622080.

The previous prime is 400451899. The next prime is 400451917. The reversal of 400451912 is 219154004.

It can be written as a sum of positive squares in only one way, i.e., 379236676 + 21215236 = 19474^2 + 4606^2 .

It is not an unprimeable number, because it can be changed into a prime (400451917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510389 + ... + 511172.

Almost surely, 2^400451912 is an apocalyptic number.

It is an amenable number.

400451912 is an abundant number, since it is smaller than the sum of its proper divisors (472983598).

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

400451912 is a wasteful number, since it uses less digits than its factorization.

400451912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021581 (or 1021570 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 400451912 is about 20011.2946107942. The cubic root of 400451912 is about 737.0836716383.

The spelling of 400451912 in words is "four hundred million, four hundred fifty-one thousand, nine hundred twelve".