634890939 has 16 divisors (see below), whose sum is σ = 877716000. Its totient is φ = 407730176.

The previous prime is 634890931. The next prime is 634890967. The reversal of 634890939 is 939098436.

It is a cyclic number.

It is not a de Polignac number, because 634890939 - 2³ = 634890931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634890891 and 634890900.

It is not an unprimeable number, because it can be changed into a prime (634890931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30937 + ... + 47189.

It is an arithmetic number, because the mean of its divisors is an integer number (54857250).

Almost surely, 2^634890939 is an apocalyptic number.

634890939 is a deficient number, since it is larger than the sum of its proper divisors (242825061).

634890939 is a wasteful number, since it uses less digits than its factorization.

634890939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16734.

The product of its (nonzero) digits is 1259712, while the sum is 51.

The square root of 634890939 is about 25197.0422669011. The cubic root of 634890939 is about 859.4745929915.

The spelling of 634890939 in words is "six hundred thirty-four million, eight hundred ninety thousand, nine hundred thirty-nine".