18912717 has 8 divisors (see below), whose sum is σ = 28018880. Its totient is φ = 12608460.

The previous prime is 18912709. The next prime is 18912731. The reversal of 18912717 is 71721981.

It is not a de Polignac number, because 18912717 - 2³ = 18912709 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 (18912797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350209 + ... + 350262.

It is an arithmetic number, because the mean of its divisors is an integer number (3502360).

Almost surely, 2^18912717 is an apocalyptic number.

It is an amenable number.

18912717 is a deficient number, since it is larger than the sum of its proper divisors (9106163).

18912717 is an equidigital number, since it uses as much as digits as its factorization.

18912717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700480 (or 700474 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 18912717 is about 4348.8753718634. The cubic root of 18912717 is about 266.4309303832.

The spelling of 18912717 in words is "eighteen million, nine hundred twelve thousand, seven hundred seventeen".