18965993 has 2 divisors, whose sum is σ = 18965994. Its totient is φ = 18965992.

The previous prime is 18965987. The next prime is 18966011. The reversal of 18965993 is 39956981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10156969 + 8809024 = 3187^2 + 2968^2 .

It is a cyclic number.

It is not a de Polignac number, because 18965993 - 2⁶ = 18965929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18965953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9482996 + 9482997.

It is an arithmetic number, because the mean of its divisors is an integer number (9482997).

Almost surely, 2^18965993 is an apocalyptic number.

It is an amenable number.

18965993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18965993 is an equidigital number, since it uses as much as digits as its factorization.

18965993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 18965993 is about 4354.9963260604. The cubic root of 18965993 is about 266.6808692088.

The spelling of 18965993 in words is "eighteen million, nine hundred sixty-five thousand, nine hundred ninety-three".