18895609 has 2 divisors, whose sum is σ = 18895610. Its totient is φ = 18895608.

The previous prime is 18895589. The next prime is 18895621. The reversal of 18895609 is 90659881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 164025 = 4328^2 + 405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18895609 is a prime.

It is not a weakly prime, because it can be changed into another prime (18896609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447804 + 9447805.

It is an arithmetic number, because the mean of its divisors is an integer number (9447805).

Almost surely, 2^18895609 is an apocalyptic number.

It is an amenable number.

18895609 is a deficient number, since it is larger than the sum of its proper divisors (1).

18895609 is an equidigital number, since it uses as much as digits as its factorization.

18895609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 18895609 is about 4346.9079815427. The cubic root of 18895609 is about 266.3505704252.

The spelling of 18895609 in words is "eighteen million, eight hundred ninety-five thousand, six hundred nine".