18675389 has 2 divisors, whose sum is σ = 18675390. Its totient is φ = 18675388.

The previous prime is 18675383. The next prime is 18675413. The reversal of 18675389 is 98357681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11002489 + 7672900 = 3317^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 18675389 - 2¹² = 18671293 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 (18675383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9337694 + 9337695.

It is an arithmetic number, because the mean of its divisors is an integer number (9337695).

Almost surely, 2^18675389 is an apocalyptic number.

It is an amenable number.

18675389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18675389 is an equidigital number, since it uses as much as digits as its factorization.

18675389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 18675389 is about 4321.5030949891. The cubic root of 18675389 is about 265.3117915490.

The spelling of 18675389 in words is "eighteen million, six hundred seventy-five thousand, three hundred eighty-nine".