18663983 has 16 divisors (see below), whose sum is σ = 20736576. Its totient is φ = 16692480.

The previous prime is 18663941. The next prime is 18664007. The reversal of 18663983 is 38936681.

It is a cyclic number.

It is not a de Polignac number, because 18663983 - 2⁶ = 18663919 is a prime.

It is a super-2 number, since 2×18663983² = 696688522848578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18663913) 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, 67241 + ... + 67517.

It is an arithmetic number, because the mean of its divisors is an integer number (1296036).

Almost surely, 2^18663983 is an apocalyptic number.

18663983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18663983 is a deficient number, since it is larger than the sum of its proper divisors (2072593).

18663983 is a wasteful number, since it uses less digits than its factorization.

18663983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434.

The product of its digits is 186624, while the sum is 44.

The square root of 18663983 is about 4320.1832137075. The cubic root of 18663983 is about 265.2577674610.

The spelling of 18663983 in words is "eighteen million, six hundred sixty-three thousand, nine hundred eighty-three".