634940831 has 24 divisors (see below), whose sum is σ = 759104640. Its totient is φ = 520087392.

The previous prime is 634940827. The next prime is 634940851. The reversal of 634940831 is 138049436.

It is not a de Polignac number, because 634940831 - 2² = 634940827 is a prime.

It is a super-3 number, since 3×634940831³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634940851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564836 + ... + 565958.

It is an arithmetic number, because the mean of its divisors is an integer number (31629360).

Almost surely, 2^634940831 is an apocalyptic number.

634940831 is a deficient number, since it is larger than the sum of its proper divisors (124163809).

634940831 is a wasteful number, since it uses less digits than its factorization.

634940831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 634940831 is about 25198.0322842876. The cubic root of 634940831 is about 859.4971059306.

The spelling of 634940831 in words is "six hundred thirty-four million, nine hundred forty thousand, eight hundred thirty-one".