634904 has 16 divisors (see below), whose sum is σ = 1253400. Its totient is φ = 300672.

The previous prime is 634903. The next prime is 634927. The reversal of 634904 is 409436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1937 + ... + 2240.

2⁶³⁴⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

634904 is a deficient number, since it is larger than the sum of its proper divisors (618496).

634904 is a wasteful number, since it uses less digits than its factorization.

634904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4202 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 634904 is about 796.8086344914. The cubic root of 634904 is about 85.9480486666.

The spelling of 634904 in words is "six hundred thirty-four thousand, nine hundred four".