18613983 has 4 divisors (see below), whose sum is σ = 24818648. Its totient is φ = 12409320.

The previous prime is 18613979. The next prime is 18614003. The reversal of 18613983 is 38931681.

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

It is not a de Polignac number, because 18613983 - 2² = 18613979 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 (18613913) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3102328 + ... + 3102333.

It is an arithmetic number, because the mean of its divisors is an integer number (6204662).

Almost surely, 2^18613983 is an apocalyptic number.

18613983 is a deficient number, since it is larger than the sum of its proper divisors (6204665).

18613983 is an equidigital number, since it uses as much as digits as its factorization.

18613983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6204664.

The product of its digits is 31104, while the sum is 39.

The square root of 18613983 is about 4314.3925412507. The cubic root of 18613983 is about 265.0206842761.

The spelling of 18613983 in words is "eighteen million, six hundred thirteen thousand, nine hundred eighty-three".