634934021 has 8 divisors (see below), whose sum is σ = 665294784. Its totient is φ = 604802880.

The previous prime is 634934017. The next prime is 634934059. The reversal of 634934021 is 120439436.

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

It is a cyclic number.

It is not a de Polignac number, because 634934021 - 2² = 634934017 is a prime.

It is a super-2 number, since 2×634934021² = 806282422046456882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634934081) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 51731 + ... + 62816.

It is an arithmetic number, because the mean of its divisors is an integer number (83161848).

Almost surely, 2^634934021 is an apocalyptic number.

It is an amenable number.

634934021 is a deficient number, since it is larger than the sum of its proper divisors (30360763).

634934021 is a wasteful number, since it uses less digits than its factorization.

634934021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114811.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 634934021 is about 25197.8971543262. The cubic root of 634934021 is about 859.4940331004.

The spelling of 634934021 in words is "six hundred thirty-four million, nine hundred thirty-four thousand, twenty-one".