400639996 has 24 divisors (see below), whose sum is σ = 722604960. Its totient is φ = 194219712.

The previous prime is 400639961. The next prime is 400639999. The reversal of 400639996 is 699936004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400639999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38745 + ... + 47983.

It is an arithmetic number, because the mean of its divisors is an integer number (30108540).

Almost surely, 2^400639996 is an apocalyptic number.

It is an amenable number.

400639996 is a deficient number, since it is larger than the sum of its proper divisors (321964964).

400639996 is a wasteful number, since it uses less digits than its factorization.

400639996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9573 (or 9571 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 400639996 is about 20015.9935051948. The cubic root of 400639996 is about 737.1990512402.

The spelling of 400639996 in words is "four hundred million, six hundred thirty-nine thousand, nine hundred ninety-six".