621975 has 12 divisors (see below), whose sum is σ = 1028456. Its totient is φ = 331680.

The previous prime is 621941. The next prime is 621983. The reversal of 621975 is 579126.

It is not a de Polignac number, because 621975 - 2¹² = 617879 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621975.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4072 + ... + 4221.

2⁶²¹⁹⁷⁵ is an apocalyptic number.

621975 is a deficient number, since it is larger than the sum of its proper divisors (406481).

621975 is a wasteful number, since it uses less digits than its factorization.

621975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8306 (or 8301 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 621975 is about 788.6539164932. The cubic root of 621975 is about 85.3606361337.

Subtracting from 621975 its reverse (579126), we obtain a square (42849 = 207²).

It can be divided in two parts, 621 and 975, that added together give a triangular number (1596 = T₅₆).

The spelling of 621975 in words is "six hundred twenty-one thousand, nine hundred seventy-five".