400644412 has 24 divisors (see below), whose sum is σ = 843463040. Its totient is φ = 162667440.

The previous prime is 400644379. The next prime is 400644451. The reversal of 400644412 is 214446004.

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, 376014 + ... + 377077.

Almost surely, 2^400644412 is an apocalyptic number.

It is an amenable number.

400644412 is an abundant number, since it is smaller than the sum of its proper divisors (442818628).

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

400644412 is a wasteful number, since it uses less digits than its factorization.

400644412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753121 (or 753119 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 400644412 is about 20016.1038166772. The cubic root of 400644412 is about 737.2017597891.

The spelling of 400644412 in words is "four hundred million, six hundred forty-four thousand, four hundred twelve".