478824921 has 6 divisors (see below), whose sum is σ = 691636010. Its totient is φ = 319216608.

The previous prime is 478824911. The next prime is 478824959. The reversal of 478824921 is 129428874.

It can be written as a sum of positive squares in only one way, i.e., 477903321 + 921600 = 21861^2 + 960^2 .

It is not a de Polignac number, because 478824921 - 2⁷ = 478824793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478824911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26601376 + ... + 26601393.

Almost surely, 2^478824921 is an apocalyptic number.

It is an amenable number.

478824921 is a deficient number, since it is larger than the sum of its proper divisors (212811089).

478824921 is a wasteful number, since it uses less digits than its factorization.

478824921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53202775 (or 53202772 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 478824921 is about 21882.0684808361. The cubic root of 478824921 is about 782.3340785367.

The spelling of 478824921 in words is "four hundred seventy-eight million, eight hundred twenty-four thousand, nine hundred twenty-one".