634979 has 2 divisors, whose sum is σ = 634980. Its totient is φ = 634978.

The previous prime is 634969. The next prime is 635003. The reversal of 634979 is 979436.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634979 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (634939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317489 + 317490.

It is an arithmetic number, because the mean of its divisors is an integer number (317490).

2⁶³⁴⁹⁷⁹ is an apocalyptic number.

634979 is a deficient number, since it is larger than the sum of its proper divisors (1).

634979 is an equidigital number, since it uses as much as digits as its factorization.

634979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 634979 is about 796.8556958446. The cubic root of 634979 is about 85.9514328264.

The spelling of 634979 in words is "six hundred thirty-four thousand, nine hundred seventy-nine".