621904 has 20 divisors (see below), whose sum is σ = 1232064. Its totient is φ = 303968.

The previous prime is 621893. The next prime is 621913. The reversal of 621904 is 409126.

621904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

621904 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339 + ... + 1165.

2⁶²¹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

621904 is a deficient number, since it is larger than the sum of its proper divisors (610160).

621904 is a wasteful number, since it uses less digits than its factorization.

621904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 621904 is about 788.6089018011. The cubic root of 621904 is about 85.3573879669.

The spelling of 621904 in words is "six hundred twenty-one thousand, nine hundred four".