18718983 has 12 divisors (see below), whose sum is σ = 27246648. Its totient is φ = 12383280.

The previous prime is 18718979. The next prime is 18719011. The reversal of 18718983 is 38981781.

It is not a de Polignac number, because 18718983 - 2² = 18718979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718943) 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 11 ways as a sum of consecutive naturals, for example, 6760 + ... + 9117.

It is an arithmetic number, because the mean of its divisors is an integer number (2270554).

Almost surely, 2^18718983 is an apocalyptic number.

18718983 is a deficient number, since it is larger than the sum of its proper divisors (8527665).

18718983 is a wasteful number, since it uses less digits than its factorization.

18718983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16014 (or 16011 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 18718983 is about 4326.5440018564. The cubic root of 18718983 is about 265.5180704183.

It can be divided in two parts, 18718 and 983, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 18718983 in words is "eighteen million, seven hundred eighteen thousand, nine hundred eighty-three".