400744404 has 18 divisors (see below), whose sum is σ = 1012992890. Its totient is φ = 133581456.

The previous prime is 400744363. The next prime is 400744411. The reversal of 400744404 is 404447004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 349764804 + 50979600 = 18702^2 + 7140^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5565859 + ... + 5565930.

Almost surely, 2^400744404 is an apocalyptic number.

It is an amenable number.

400744404 is an abundant number, since it is smaller than the sum of its proper divisors (612248486).

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

400744404 is a wasteful number, since it uses less digits than its factorization.

400744404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11131799 (or 11131794 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 27.

The square root of 400744404 is about 20018.6014496518. The cubic root of 400744404 is about 737.2630844488.

The spelling of 400744404 in words is "four hundred million, seven hundred forty-four thousand, four hundred four".