621725 has 12 divisors (see below), whose sum is σ = 830676. Its totient is φ = 458880.

The previous prime is 621721. The next prime is 621739. The reversal of 621725 is 527126.

It can be written as a sum of positive squares in 6 ways, for example, as 10201 + 611524 = 101^2 + 782^2 .

It is not a de Polignac number, because 621725 - 2² = 621721 is a prime.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 632 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (69223).

2⁶²¹⁷²⁵ is an apocalyptic number.

621725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

621725 is a deficient number, since it is larger than the sum of its proper divisors (208951).

621725 is a wasteful number, since it uses less digits than its factorization.

621725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936 (or 1931 counting only the distinct ones).

The product of its digits is 840, while the sum is 23.

The square root of 621725 is about 788.4954026499. The cubic root of 621725 is about 85.3491978290.

The spelling of 621725 in words is "six hundred twenty-one thousand, seven hundred twenty-five".