817388099 has 16 divisors (see below), whose sum is σ = 938732544. Its totient is φ = 704457600.

The previous prime is 817388083. The next prime is 817388111. The reversal of 817388099 is 990883718.

It is a Cunningham number, because it is equal to 28590²-1.

It is not a de Polignac number, because 817388099 - 2⁴ = 817388083 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 817388099.

It is not an unprimeable number, because it can be changed into a prime (817388029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14294 + ... + 42884.

It is an arithmetic number, because the mean of its divisors is an integer number (58670784).

Almost surely, 2^817388099 is an apocalyptic number.

817388099 is a deficient number, since it is larger than the sum of its proper divisors (121344445).

817388099 is a wasteful number, since it uses less digits than its factorization.

817388099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28738.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 817388099 is about 28589.9999825114. Note that the first 4 decimals coincide. The cubic root of 817388099 is about 934.9953192594.

The spelling of 817388099 in words is "eight hundred seventeen million, three hundred eighty-eight thousand, ninety-nine".