621375 has 16 divisors (see below), whose sum is σ = 1034592. Its totient is φ = 331200.

The previous prime is 621371. The next prime is 621389. The reversal of 621375 is 573126.

It is not a de Polignac number, because 621375 - 2² = 621371 is a prime.

It is a super-2 number, since 2×621375² = 772213781250, which contains 22 as substring.

621375 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454 + ... + 1203.

It is an arithmetic number, because the mean of its divisors is an integer number (64662).

2⁶²¹³⁷⁵ is an apocalyptic number.

621375 is a deficient number, since it is larger than the sum of its proper divisors (413217).

621375 is a wasteful number, since it uses less digits than its factorization.

621375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675 (or 1665 counting only the distinct ones).

The product of its digits is 1260, while the sum is 24.

The square root of 621375 is about 788.2734297184. The cubic root of 621375 is about 85.3331790497. Note that the first 3 decimals are identical.

The spelling of 621375 in words is "six hundred twenty-one thousand, three hundred seventy-five".