404615988 has 36 divisors (see below), whose sum is σ = 1168891360. Its totient is φ = 115604496.

The previous prime is 404615987. The next prime is 404615993. The reversal of 404615988 is 889516404.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×404615988² = 327428195490432288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404615987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 802558 + ... + 803061.

Almost surely, 2^404615988 is an apocalyptic number.

It is an amenable number.

404615988 is an abundant number, since it is smaller than the sum of its proper divisors (764275372).

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

404615988 is a wasteful number, since it uses less digits than its factorization.

404615988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605636 (or 1605631 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 404615988 is about 20115.0686799722. The cubic root of 404615988 is about 739.6297076042.

The spelling of 404615988 in words is "four hundred four million, six hundred fifteen thousand, nine hundred eighty-eight".