621884 has 12 divisors (see below), whose sum is σ = 1099224. Its totient is φ = 307824.

The previous prime is 621883. The next prime is 621893. The reversal of 621884 is 488126.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (91602).

2⁶²¹⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

621884 is a deficient number, since it is larger than the sum of its proper divisors (477340).

621884 is a wasteful number, since it uses less digits than its factorization.

621884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564 (or 1562 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 621884 is about 788.5962211424. The cubic root of 621884 is about 85.3564729456.

The spelling of 621884 in words is "six hundred twenty-one thousand, eight hundred eighty-four".