18885317 has 12 divisors (see below), whose sum is σ = 21981708. Its totient is φ = 16156800.

The previous prime is 18885289. The next prime is 18885329. The reversal of 18885317 is 71358881.

It can be written as a sum of positive squares in 2 ways, for example, as 13498276 + 5387041 = 3674^2 + 2321^2 .

It is not a de Polignac number, because 18885317 - 2⁶ = 18885253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18885337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2534 + ... + 6647.

It is an arithmetic number, because the mean of its divisors is an integer number (1831809).

Almost surely, 2^18885317 is an apocalyptic number.

18885317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18885317 is a deficient number, since it is larger than the sum of its proper divisors (3096391).

18885317 is a wasteful number, since it uses less digits than its factorization.

18885317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220 (or 9209 counting only the distinct ones).

The product of its digits is 53760, while the sum is 41.

The square root of 18885317 is about 4345.7239903151. The cubic root of 18885317 is about 266.3022033165.

The spelling of 18885317 in words is "eighteen million, eight hundred eighty-five thousand, three hundred seventeen".