18998093 has 2 divisors, whose sum is σ = 18998094. Its totient is φ = 18998092.

The previous prime is 18998053. The next prime is 18998101. The reversal of 18998093 is 39089981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 5929 = 4358^2 + 77^2 .

It is a cyclic number.

It is not a de Polignac number, because 18998093 - 2⁸ = 18997837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18998033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9499046 + 9499047.

It is an arithmetic number, because the mean of its divisors is an integer number (9499047).

Almost surely, 2^18998093 is an apocalyptic number.

It is an amenable number.

18998093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18998093 is an equidigital number, since it uses as much as digits as its factorization.

18998093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 18998093 is about 4358.6801901493. The cubic root of 18998093 is about 266.8312371315.

The spelling of 18998093 in words is "eighteen million, nine hundred ninety-eight thousand, ninety-three".