400406044 has 12 divisors (see below), whose sum is σ = 723314368. Its totient is φ = 193744800.

The previous prime is 400406029. The next prime is 400406087. The reversal of 400406044 is 440604004.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614417 + ... + 1614664.

Almost surely, 2^400406044 is an apocalyptic number.

It is an amenable number.

400406044 is a deficient number, since it is larger than the sum of its proper divisors (322908324).

400406044 is a wasteful number, since it uses less digits than its factorization.

400406044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229116 (or 3229114 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 400406044 is about 20010.1485251859. The cubic root of 400406044 is about 737.0555285632.

The spelling of 400406044 in words is "four hundred million, four hundred six thousand, forty-four".