634821479 has 4 divisors (see below), whose sum is σ = 639388680. Its totient is φ = 630254280.

The previous prime is 634821443. The next prime is 634821529. The reversal of 634821479 is 974128436.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634821479 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 (634821079) 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, 2283392 + ... + 2283669.

It is an arithmetic number, because the mean of its divisors is an integer number (159847170).

Almost surely, 2^634821479 is an apocalyptic number.

634821479 is a deficient number, since it is larger than the sum of its proper divisors (4567201).

634821479 is a wasteful number, since it uses less digits than its factorization.

634821479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567200.

The product of its digits is 290304, while the sum is 44.

The square root of 634821479 is about 25195.6638928209. The cubic root of 634821479 is about 859.4432483522.

The spelling of 634821479 in words is "six hundred thirty-four million, eight hundred twenty-one thousand, four hundred seventy-nine".