404937621 has 12 divisors (see below), whose sum is σ = 638083680. Its totient is φ = 245416680.

The previous prime is 404937601. The next prime is 404937679. The reversal of 404937621 is 126739404.

It is not a de Polignac number, because 404937621 - 2⁹ = 404937109 is a prime.

It is a super-2 number, since 2×404937621² = 327948953802279282, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404937601) 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, 2045041 + ... + 2045238.

It is an arithmetic number, because the mean of its divisors is an integer number (53173640).

Almost surely, 2^404937621 is an apocalyptic number.

It is an amenable number.

404937621 is a deficient number, since it is larger than the sum of its proper divisors (233146059).

404937621 is a wasteful number, since it uses less digits than its factorization.

404937621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090296 (or 4090293 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 404937621 is about 20123.0619191017. The cubic root of 404937621 is about 739.8256352024.

The spelling of 404937621 in words is "four hundred four million, nine hundred thirty-seven thousand, six hundred twenty-one".