634393939 has 4 divisors (see below), whose sum is σ = 634450600. Its totient is φ = 634337280.

The previous prime is 634393933. The next prime is 634393957. The reversal of 634393939 is 939393436.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 634393939 - 2²¹ = 632296787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634393892 and 634393901.

It is not an unprimeable number, because it can be changed into a prime (634393933) 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 3 ways as a sum of consecutive naturals, for example, 5289 + ... + 36010.

It is an arithmetic number, because the mean of its divisors is an integer number (158612650).

Almost surely, 2^634393939 is an apocalyptic number.

634393939 is a deficient number, since it is larger than the sum of its proper divisors (56661).

634393939 is a wasteful number, since it uses less digits than its factorization.

634393939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56660.

The product of its digits is 1417176, while the sum is 49.

The square root of 634393939 is about 25187.1780674215. The cubic root of 634393939 is about 859.2502655485.

The spelling of 634393939 in words is "six hundred thirty-four million, three hundred ninety-three thousand, nine hundred thirty-nine".