18913983 has 16 divisors (see below), whose sum is σ = 27734016. Its totient is φ = 11370240.

The previous prime is 18913969. The next prime is 18913991. The reversal of 18913983 is 38931981.

It is a happy number.

It is not a de Polignac number, because 18913983 - 2⁹ = 18913471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913913) 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 15 ways as a sum of consecutive naturals, for example, 1935 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (1733376).

Almost surely, 2^18913983 is an apocalyptic number.

18913983 is a deficient number, since it is larger than the sum of its proper divisors (8820033).

18913983 is a wasteful number, since it uses less digits than its factorization.

18913983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4654.

The product of its digits is 46656, while the sum is 42.

The square root of 18913983 is about 4349.0209243001. The cubic root of 18913983 is about 266.4368751316.

The spelling of 18913983 in words is "eighteen million, nine hundred thirteen thousand, nine hundred eighty-three".