634974709 has 4 divisors (see below), whose sum is σ = 641139616. Its totient is φ = 628809804.

The previous prime is 634974689. The next prime is 634974713. The reversal of 634974709 is 907479436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634974709 - 2²³ = 626586101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634974719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3082299 + ... + 3082504.

It is an arithmetic number, because the mean of its divisors is an integer number (160284904).

Almost surely, 2^634974709 is an apocalyptic number.

It is an amenable number.

634974709 is a deficient number, since it is larger than the sum of its proper divisors (6164907).

634974709 is a wasteful number, since it uses less digits than its factorization.

634974709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6164906.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The square root of 634974709 is about 25198.7045103513. The cubic root of 634974709 is about 859.5123921451.

The spelling of 634974709 in words is "six hundred thirty-four million, nine hundred seventy-four thousand, seven hundred nine".