634349479 has 4 divisors (see below), whose sum is σ = 634901760. Its totient is φ = 633797200.

The previous prime is 634349477. The next prime is 634349549. The reversal of 634349479 is 974943436.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 634349479 - 2¹ = 634349477 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 (634349477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274414 + ... + 276715.

It is an arithmetic number, because the mean of its divisors is an integer number (158725440).

Almost surely, 2^634349479 is an apocalyptic number.

634349479 is a deficient number, since it is larger than the sum of its proper divisors (552281).

634349479 is a wasteful number, since it uses less digits than its factorization.

634349479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552280.

The product of its digits is 1959552, while the sum is 49.

The square root of 634349479 is about 25186.2954600314. The cubic root of 634349479 is about 859.2301922381.

The spelling of 634349479 in words is "six hundred thirty-four million, three hundred forty-nine thousand, four hundred seventy-nine".