634665 has 16 divisors (see below), whose sum is σ = 1051200. Its totient is φ = 326592.

The previous prime is 634651. The next prime is 634679. The reversal of 634665 is 566436.

It is an interprime number because it is at equal distance from previous prime (634651) and next prime (634679).

It is not a de Polignac number, because 634665 - 2⁴ = 634649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295 + ... + 1164.

It is an arithmetic number, because the mean of its divisors is an integer number (65700).

2⁶³⁴⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

634665 is a deficient number, since it is larger than the sum of its proper divisors (416535).

634665 is a wasteful number, since it uses less digits than its factorization.

634665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496.

The product of its digits is 12960, while the sum is 30.

The square root of 634665 is about 796.6586471005. The cubic root of 634665 is about 85.9372626991.

The spelling of 634665 in words is "six hundred thirty-four thousand, six hundred sixty-five".