400639804 has 6 divisors (see below), whose sum is σ = 701119664. Its totient is φ = 200319900.

The previous prime is 400639777. The next prime is 400639807. The reversal of 400639804 is 408936004.

It is a self number, because there is not a number n which added to its sum of digits gives 400639804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400639807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50079972 + ... + 50079979.

Almost surely, 2^400639804 is an apocalyptic number.

It is an amenable number.

400639804 is a deficient number, since it is larger than the sum of its proper divisors (300479860).

400639804 is a wasteful number, since it uses less digits than its factorization.

400639804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100159955 (or 100159953 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 400639804 is about 20015.9887090296. The cubic root of 400639804 is about 737.1989334767.

The spelling of 400639804 in words is "four hundred million, six hundred thirty-nine thousand, eight hundred four".