18573689 has 2 divisors, whose sum is σ = 18573690. Its totient is φ = 18573688.

The previous prime is 18573683. The next prime is 18573703. The reversal of 18573689 is 98637581.

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., 12020089 + 6553600 = 3467^2 + 2560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18573689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18573683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9286844 + 9286845.

It is an arithmetic number, because the mean of its divisors is an integer number (9286845).

Almost surely, 2^18573689 is an apocalyptic number.

It is an amenable number.

18573689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18573689 is an equidigital number, since it uses as much as digits as its factorization.

18573689 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 18573689 is about 4309.7202925480. The cubic root of 18573689 is about 264.8293145548.

The spelling of 18573689 in words is "eighteen million, five hundred seventy-three thousand, six hundred eighty-nine".