400512006 has 16 divisors (see below), whose sum is σ = 890026800. Its totient is φ = 133503984.

The previous prime is 400511981. The next prime is 400512029. The reversal of 400512006 is 600215004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 400512006.

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, 3708391 + ... + 3708498.

It is an arithmetic number, because the mean of its divisors is an integer number (55626675).

Almost surely, 2^400512006 is an apocalyptic number.

400512006 is an abundant number, since it is smaller than the sum of its proper divisors (489514794).

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

400512006 is a wasteful number, since it uses less digits than its factorization.

400512006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416900 (or 7416894 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 400512006 is about 20012.7960565234. The cubic root of 400512006 is about 737.1205400607.

The spelling of 400512006 in words is "four hundred million, five hundred twelve thousand, six".