634558 has 4 divisors (see below), whose sum is σ = 951840. Its totient is φ = 317278.

The previous prime is 634541. The next prime is 634567. The reversal of 634558 is 855436.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

634558 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158638 + ... + 158641.

It is an arithmetic number, because the mean of its divisors is an integer number (237960).

2⁶³⁴⁵⁵⁸ is an apocalyptic number.

634558 is a deficient number, since it is larger than the sum of its proper divisors (317282).

634558 is a wasteful number, since it uses less digits than its factorization.

634558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317281.

The product of its digits is 14400, while the sum is 31.

The square root of 634558 is about 796.5914887820. The cubic root of 634558 is about 85.9324329574.

The spelling of 634558 in words is "six hundred thirty-four thousand, five hundred fifty-eight".