18725489 has 2 divisors, whose sum is σ = 18725490. Its totient is φ = 18725488.

The previous prime is 18725471. The next prime is 18725527. The reversal of 18725489 is 98452781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 4133089 = 3820^2 + 2033^2 .

It is a cyclic number.

It is not a de Polignac number, because 18725489 - 2¹² = 18721393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18725419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9362744 + 9362745.

It is an arithmetic number, because the mean of its divisors is an integer number (9362745).

Almost surely, 2^18725489 is an apocalyptic number.

It is an amenable number.

18725489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18725489 is an equidigital number, since it uses as much as digits as its factorization.

18725489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 18725489 is about 4327.2958068521. The cubic root of 18725489 is about 265.5488281518.

The spelling of 18725489 in words is "eighteen million, seven hundred twenty-five thousand, four hundred eighty-nine".