633979 has 4 divisors (see below), whose sum is σ = 638680. Its totient is φ = 629280.

The previous prime is 633967. The next prime is 633991. The reversal of 633979 is 979336.

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

It is an interprime number because it is at equal distance from previous prime (633967) and next prime (633991).

It is a cyclic number.

It is not a de Polignac number, because 633979 - 2⁹ = 633467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (633079) 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, 2142 + ... + 2419.

It is an arithmetic number, because the mean of its divisors is an integer number (159670).

2⁶³³⁹⁷⁹ is an apocalyptic number.

633979 is a deficient number, since it is larger than the sum of its proper divisors (4701).

633979 is a wasteful number, since it uses less digits than its factorization.

633979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700.

The product of its digits is 30618, while the sum is 37.

The square root of 633979 is about 796.2279824271. The cubic root of 633979 is about 85.9062887651.

The spelling of 633979 in words is "six hundred thirty-three thousand, nine hundred seventy-nine".