634990 has 8 divisors (see below), whose sum is σ = 1143000. Its totient is φ = 253992.

The previous prime is 634979. The next prime is 635003. The reversal of 634990 is 99436.

634990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31740 + ... + 31759.

It is an arithmetic number, because the mean of its divisors is an integer number (142875).

2⁶³⁴⁹⁹⁰ is an apocalyptic number.

634990 is a deficient number, since it is larger than the sum of its proper divisors (508010).

634990 is a wasteful number, since it uses less digits than its factorization.

634990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63506.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 634990 is about 796.8625979427. The cubic root of 634990 is about 85.9519291474.

The spelling of 634990 in words is "six hundred thirty-four thousand, nine hundred ninety".