400042928 has 10 divisors (see below), whose sum is σ = 775083204. Its totient is φ = 200021456.

The previous prime is 400042919. The next prime is 400042943. The reversal of 400042928 is 829240004.

It is a self number, because there is not a number n which added to its sum of digits gives 400042928.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12501326 + ... + 12501357.

Almost surely, 2^400042928 is an apocalyptic number.

It is an amenable number.

400042928 is a deficient number, since it is larger than the sum of its proper divisors (375040276).

400042928 is a wasteful number, since it uses less digits than its factorization.

400042928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25002691 (or 25002685 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 400042928 is about 20001.0731712076. The cubic root of 400042928 is about 736.8326568026.

The spelling of 400042928 in words is "four hundred million, forty-two thousand, nine hundred twenty-eight".