817472979 has 20 divisors (see below), whose sum is σ = 1226523760. Its totient is φ = 542589840.

The previous prime is 817472947. The next prime is 817472983. The reversal of 817472979 is 979274718.

817472979 is a `hidden beast` number, since 81 + 7 + 472 + 97 + 9 = 666.

It is not a de Polignac number, because 817472979 - 2⁵ = 817472947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817472939) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3487 + ... + 40584.

It is an arithmetic number, because the mean of its divisors is an integer number (61326188).

Almost surely, 2^817472979 is an apocalyptic number.

817472979 is a deficient number, since it is larger than the sum of its proper divisors (409050781).

817472979 is a wasteful number, since it uses less digits than its factorization.

817472979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44312 (or 44303 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 817472979 is about 28591.4843790944. The cubic root of 817472979 is about 935.0276823665.

The spelling of 817472979 in words is "eight hundred seventeen million, four hundred seventy-two thousand, nine hundred seventy-nine".