479478821 has 4 divisors (see below), whose sum is σ = 479529600. Its totient is φ = 479428044.

The previous prime is 479478803. The next prime is 479478847. The reversal of 479478821 is 128874974.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 128874974 = 2 ⋅64437487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-479478821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 479478821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (479478221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6581 + ... + 31658.

It is an arithmetic number, because the mean of its divisors is an integer number (119882400).

Almost surely, 2^479478821 is an apocalyptic number.

It is an amenable number.

479478821 is a deficient number, since it is larger than the sum of its proper divisors (50779).

479478821 is a wasteful number, since it uses less digits than its factorization.

479478821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50778.

The product of its digits is 903168, while the sum is 50.

The square root of 479478821 is about 21897.0048408452. The cubic root of 479478821 is about 782.6900441073.

The spelling of 479478821 in words is "four hundred seventy-nine million, four hundred seventy-eight thousand, eight hundred twenty-one".