18719983 has 2 divisors, whose sum is σ = 18719984. Its totient is φ = 18719982.

The previous prime is 18719969. The next prime is 18720083. The reversal of 18719983 is 38991781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18719983 - 2²¹ = 16622831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18719963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9359991 + 9359992.

It is an arithmetic number, because the mean of its divisors is an integer number (9359992).

Almost surely, 2^18719983 is an apocalyptic number.

18719983 is a deficient number, since it is larger than the sum of its proper divisors (1).

18719983 is an equidigital number, since it uses as much as digits as its factorization.

18719983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 18719983 is about 4326.6595659931. The cubic root of 18719983 is about 265.5227984768.

The spelling of 18719983 in words is "eighteen million, seven hundred nineteen thousand, nine hundred eighty-three".