634638539 has 8 divisors (see below), whose sum is σ = 649036608. Its totient is φ = 620385480.

The previous prime is 634638503. The next prime is 634638583. The reversal of 634638539 is 935836436.

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 634638539 - 2¹² = 634634443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634638493 and 634638502.

It is not an unprimeable number, because it can be changed into a prime (634632539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27377 + ... + 44930.

It is an arithmetic number, because the mean of its divisors is an integer number (81129576).

Almost surely, 2^634638539 is an apocalyptic number.

634638539 is a deficient number, since it is larger than the sum of its proper divisors (14398069).

634638539 is a wasteful number, since it uses less digits than its factorization.

634638539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72505.

The product of its digits is 1399680, while the sum is 47.

The square root of 634638539 is about 25192.0332446589. The cubic root of 634638539 is about 859.3606835900.

The spelling of 634638539 in words is "six hundred thirty-four million, six hundred thirty-eight thousand, five hundred thirty-nine".