400352520 has 32 divisors (see below), whose sum is σ = 1201057920. Its totient is φ = 106760640.

The previous prime is 400352471. The next prime is 400352549. The reversal of 400352520 is 25253004.

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, 1668016 + ... + 1668255.

It is an arithmetic number, because the mean of its divisors is an integer number (37533060).

Almost surely, 2^400352520 is an apocalyptic number.

400352520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400352520 is an abundant number, since it is smaller than the sum of its proper divisors (800705400).

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

400352520 is a wasteful number, since it uses less digits than its factorization.

400352520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336285 (or 3336281 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 400352520 is about 20008.8110591309. The cubic root of 400352520 is about 737.0226853043.

The spelling of 400352520 in words is "four hundred million, three hundred fifty-two thousand, five hundred twenty".