18713998 has 4 divisors (see below), whose sum is σ = 28071000. Its totient is φ = 9356998.

The previous prime is 18713963. The next prime is 18714011. The reversal of 18713998 is 89931781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89931781 = 149 ⋅603569.

It is a super-2 number, since 2×18713998² = 700427442288008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4678498 + ... + 4678501.

It is an arithmetic number, because the mean of its divisors is an integer number (7017750).

Almost surely, 2^18713998 is an apocalyptic number.

18713998 is a deficient number, since it is larger than the sum of its proper divisors (9357002).

18713998 is an equidigital number, since it uses as much as digits as its factorization.

18713998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9357001.

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

The square root of 18713998 is about 4325.9678685816. The cubic root of 18713998 is about 265.4944985342.

The spelling of 18713998 in words is "eighteen million, seven hundred thirteen thousand, nine hundred ninety-eight".