630979 has 4 divisors (see below), whose sum is σ = 636984. Its totient is φ = 624976.

The previous prime is 630967. The next prime is 630997. The reversal of 630979 is 979036.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 630979 - 2⁹ = 630467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842 + ... + 3055.

It is an arithmetic number, because the mean of its divisors is an integer number (159246).

2⁶³⁰⁹⁷⁹ is an apocalyptic number.

630979 is a deficient number, since it is larger than the sum of its proper divisors (6005).

630979 is a wasteful number, since it uses less digits than its factorization.

630979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6004.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 630979 is about 794.3418659494. The cubic root of 630979 is about 85.7705711002.

The spelling of 630979 in words is "six hundred thirty thousand, nine hundred seventy-nine".