18950489 has 2 divisors, whose sum is σ = 18950490. Its totient is φ = 18950488.

The previous prime is 18950479. The next prime is 18950497. The reversal of 18950489 is 98405981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 1243225 = 4208^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 18950489 - 2⁸ = 18950233 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18950479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9475244 + 9475245.

It is an arithmetic number, because the mean of its divisors is an integer number (9475245).

Almost surely, 2^18950489 is an apocalyptic number.

It is an amenable number.

18950489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18950489 is an equidigital number, since it uses as much as digits as its factorization.

18950489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18950489 is about 4353.2159376718. The cubic root of 18950489 is about 266.6081821396.

The spelling of 18950489 in words is "eighteen million, nine hundred fifty thousand, four hundred eighty-nine".