400604505520 has 40 divisors (see below), whose sum is σ = 934867999440. Its totient is φ = 159646099200.

The previous prime is 400604505479. The next prime is 400604505527. The reversal of 400604505520 is 25505406004.

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

It is not an unprimeable number, because it can be changed into a prime (400604505527) 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, 9286206 + ... + 9329245.

It is an arithmetic number, because the mean of its divisors is an integer number (23371699986).

Almost surely, 2^400604505520 is an apocalyptic number.

400604505520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400604505520 is an abundant number, since it is smaller than the sum of its proper divisors (534263493920).

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

400604505520 is a wasteful number, since it uses less digits than its factorization.

400604505520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18615733 (or 18615727 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 400604505520 in words is "four hundred billion, six hundred four million, five hundred five thousand, five hundred twenty".