18813983 has 2 divisors, whose sum is σ = 18813984. Its totient is φ = 18813982.

The previous prime is 18813961. The next prime is 18813989. The reversal of 18813983 is 38931881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18813983 - 2¹² = 18809887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18813983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18813989) 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 as a sum of consecutive naturals, namely, 9406991 + 9406992.

It is an arithmetic number, because the mean of its divisors is an integer number (9406992).

Almost surely, 2^18813983 is an apocalyptic number.

18813983 is a deficient number, since it is larger than the sum of its proper divisors (1).

18813983 is an equidigital number, since it uses as much as digits as its factorization.

18813983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 18813983 is about 4337.5088472532. The cubic root of 18813983 is about 265.9664862520.

The spelling of 18813983 in words is "eighteen million, eight hundred thirteen thousand, nine hundred eighty-three".