18713989 has 8 divisors (see below), whose sum is σ = 21500928. Its totient is φ = 15955440.

The previous prime is 18713963. The next prime is 18714011. The reversal of 18713989 is 98931781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18713989 - 2¹⁹ = 18189701 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 (18713489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5662 + ... + 8335.

It is an arithmetic number, because the mean of its divisors is an integer number (2687616).

Almost surely, 2^18713989 is an apocalyptic number.

It is an amenable number.

18713989 is a deficient number, since it is larger than the sum of its proper divisors (2786939).

18713989 is a wasteful number, since it uses less digits than its factorization.

18713989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14195.

The product of its digits is 108864, while the sum is 46.

The square root of 18713989 is about 4325.9668283518. The cubic root of 18713989 is about 265.4944559733.

The spelling of 18713989 in words is "eighteen million, seven hundred thirteen thousand, nine hundred eighty-nine".