400599920 has 40 divisors (see below), whose sum is σ = 1064452704. Its totient is φ = 137348352.

The previous prime is 400599907. The next prime is 400599943. The reversal of 400599920 is 29995004.

It is a tau number, because it is divible by the number of its divisors (40).

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, 357119 + ... + 358238.

Almost surely, 2^400599920 is an apocalyptic number.

400599920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400599920 is an abundant number, since it is smaller than the sum of its proper divisors (663852784).

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

400599920 is a wasteful number, since it uses less digits than its factorization.

400599920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715377 (or 715371 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 400599920 is about 20014.9923807130. The cubic root of 400599920 is about 737.1744697584.

The spelling of 400599920 in words is "four hundred million, five hundred ninety-nine thousand, nine hundred twenty".