18713999 has 4 divisors (see below), whose sum is σ = 19170480. Its totient is φ = 18257520.

The previous prime is 18713963. The next prime is 18714011. The reversal of 18713999 is 99931781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18713999 - 2²⁴ = 1936783 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 (18713899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228179 + ... + 228260.

It is an arithmetic number, because the mean of its divisors is an integer number (4792620).

Almost surely, 2^18713999 is an apocalyptic number.

18713999 is a deficient number, since it is larger than the sum of its proper divisors (456481).

18713999 is an equidigital number, since it uses as much as digits as its factorization.

18713999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456480.

The product of its digits is 122472, while the sum is 47.

The square root of 18713999 is about 4325.9679841626. The cubic root of 18713999 is about 265.4945032631.

The spelling of 18713999 in words is "eighteen million, seven hundred thirteen thousand, nine hundred ninety-nine".