18708983 has 4 divisors (see below), whose sum is σ = 18843720. Its totient is φ = 18574248.

The previous prime is 18708979. The next prime is 18709003. The reversal of 18708983 is 38980781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38980781 = 7 ⋅5568683.

It is a cyclic number.

It is not a de Polignac number, because 18708983 - 2² = 18708979 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 (18708923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67160 + ... + 67437.

It is an arithmetic number, because the mean of its divisors is an integer number (4710930).

Almost surely, 2^18708983 is an apocalyptic number.

18708983 is a deficient number, since it is larger than the sum of its proper divisors (134737).

18708983 is a wasteful number, since it uses less digits than its factorization.

18708983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134736.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18708983 is about 4325.3881906714. The cubic root of 18708983 is about 265.4707805689.

It can be divided in two parts, 18708 and 983, that added together give a palindrome (19691).

The spelling of 18708983 in words is "eighteen million, seven hundred eight thousand, nine hundred eighty-three".