621885 has 16 divisors (see below), whose sum is σ = 1085760. Its totient is φ = 301440.

The previous prime is 621883. The next prime is 621893. The reversal of 621885 is 588126.

It is not a de Polignac number, because 621885 - 2¹ = 621883 is a prime.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1720 + ... + 2049.

It is an arithmetic number, because the mean of its divisors is an integer number (67860).

2⁶²¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

621885 is a deficient number, since it is larger than the sum of its proper divisors (463875).

621885 is a wasteful number, since it uses less digits than its factorization.

621885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788.

The product of its digits is 3840, while the sum is 30.

The square root of 621885 is about 788.5968551801. The cubic root of 621885 is about 85.3565186972.

The spelling of 621885 in words is "six hundred twenty-one thousand, eight hundred eighty-five".