18371489 has 2 divisors, whose sum is σ = 18371490. Its totient is φ = 18371488.

The previous prime is 18371473. The next prime is 18371497. The reversal of 18371489 is 98417381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 664225 = 4208^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 18371489 - 2⁴ = 18371473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18371429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9185744 + 9185745.

It is an arithmetic number, because the mean of its divisors is an integer number (9185745).

Almost surely, 2^18371489 is an apocalyptic number.

It is an amenable number.

18371489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18371489 is an equidigital number, since it uses as much as digits as its factorization.

18371489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18371489 is about 4286.1974989494. The cubic root of 18371489 is about 263.8647962804.

The spelling of 18371489 in words is "eighteen million, three hundred seventy-one thousand, four hundred eighty-nine".