621395404 has 24 divisors (see below), whose sum is σ = 1243628960. Its totient is φ = 266132736.

The previous prime is 621395387. The next prime is 621395443. The reversal of 621395404 is 404593126.

It is a happy number.

621395404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×621395404² = 772264496224646432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621395404.

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, 40084 + ... + 53380.

Almost surely, 2^621395404 is an apocalyptic number.

It is an amenable number.

621395404 is an abundant number, since it is smaller than the sum of its proper divisors (622233556).

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

621395404 is a wasteful number, since it uses less digits than its factorization.

621395404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14977 (or 14975 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 621395404 is about 24927.8038342731. The cubic root of 621395404 is about 853.3411306389.

The spelling of 621395404 in words is "six hundred twenty-one million, three hundred ninety-five thousand, four hundred four".