630639 has 8 divisors (see below), whose sum is σ = 934320. Its totient is φ = 420408.

The previous prime is 630613. The next prime is 630659. The reversal of 630639 is 936036.

It is not a de Polignac number, because 630639 - 2⁵ = 630607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23357 = 630639 / (6 + 3 + 0 + 6 + 3 + 9).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11652 + ... + 11705.

It is an arithmetic number, because the mean of its divisors is an integer number (116790).

2⁶³⁰⁶³⁹ is an apocalyptic number.

630639 is a deficient number, since it is larger than the sum of its proper divisors (303681).

630639 is a wasteful number, since it uses less digits than its factorization.

630639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23366 (or 23360 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 630639 is about 794.1278234642. The cubic root of 630639 is about 85.7551626457.

The spelling of 630639 in words is "six hundred thirty thousand, six hundred thirty-nine".