18746489 has 2 divisors, whose sum is σ = 18746490. Its totient is φ = 18746488.

The previous prime is 18746447. The next prime is 18746503. The reversal of 18746489 is 98464781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9504889 + 9241600 = 3083^2 + 3040^2 .

It is a cyclic number.

It is not a de Polignac number, because 18746489 - 2²⁰ = 17697913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18746419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9373244 + 9373245.

It is an arithmetic number, because the mean of its divisors is an integer number (9373245).

Almost surely, 2^18746489 is an apocalyptic number.

It is an amenable number.

18746489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18746489 is an equidigital number, since it uses as much as digits as its factorization.

18746489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The square root of 18746489 is about 4329.7215845825. The cubic root of 18746489 is about 265.6480590639.

The spelling of 18746489 in words is "eighteen million, seven hundred forty-six thousand, four hundred eighty-nine".