478817931 has 4 divisors (see below), whose sum is σ = 638423912. Its totient is φ = 319211952.

The previous prime is 478817929. The next prime is 478817939. The reversal of 478817931 is 139718874.

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

It is not a de Polignac number, because 478817931 - 2¹ = 478817929 is a prime.

It is a super-2 number, since 2×478817931² = 458533222094241522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478817939) 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, 79802986 + ... + 79802991.

It is an arithmetic number, because the mean of its divisors is an integer number (159605978).

Almost surely, 2^478817931 is an apocalyptic number.

478817931 is a deficient number, since it is larger than the sum of its proper divisors (159605981).

478817931 is a wasteful number, since it uses less digits than its factorization.

478817931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159605980.

The product of its digits is 338688, while the sum is 48.

The square root of 478817931 is about 21881.9087604350. The cubic root of 478817931 is about 782.3302716186.

The spelling of 478817931 in words is "four hundred seventy-eight million, eight hundred seventeen thousand, nine hundred thirty-one".