634420156 has 12 divisors (see below), whose sum is σ = 1129053240. Its totient is φ = 311833520.

The previous prime is 634420139. The next prime is 634420169. The reversal of 634420156 is 651024436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343875 + ... + 1344346.

It is an arithmetic number, because the mean of its divisors is an integer number (94087770).

Almost surely, 2^634420156 is an apocalyptic number.

It is an amenable number.

634420156 is a deficient number, since it is larger than the sum of its proper divisors (494633084).

634420156 is a wasteful number, since it uses less digits than its factorization.

634420156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688284 (or 2688282 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 634420156 is about 25187.6985054213. The cubic root of 634420156 is about 859.2621018605.

The spelling of 634420156 in words is "six hundred thirty-four million, four hundred twenty thousand, one hundred fifty-six".