404564240 has 20 divisors (see below), whose sum is σ = 940612044. Its totient is φ = 161825664.

The previous prime is 404564233. The next prime is 404564257. The reversal of 404564240 is 42465404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101525776 + 303038464 = 10076^2 + 17408^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528447 + ... + 2528606.

Almost surely, 2^404564240 is an apocalyptic number.

404564240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404564240 is an abundant number, since it is smaller than the sum of its proper divisors (536047804).

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

404564240 is a wasteful number, since it uses less digits than its factorization.

404564240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057066 (or 5057060 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 404564240 is about 20113.7823394806. The cubic root of 404564240 is about 739.5981748332.

The spelling of 404564240 in words is "four hundred four million, five hundred sixty-four thousand, two hundred forty".