18682889 has 4 divisors (see below), whose sum is σ = 18777924. Its totient is φ = 18587856.

The previous prime is 18682849. The next prime is 18682901. The reversal of 18682889 is 98828681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14500864 + 4182025 = 3808^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 18682889 - 2²⁰ = 17634313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18682849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47222 + ... + 47615.

It is an arithmetic number, because the mean of its divisors is an integer number (4694481).

Almost surely, 2^18682889 is an apocalyptic number.

It is an amenable number.

18682889 is a deficient number, since it is larger than the sum of its proper divisors (95035).

18682889 is an equidigital number, since it uses as much as digits as its factorization.

18682889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95034.

The product of its digits is 442368, while the sum is 50.

The square root of 18682889 is about 4322.3707615150. The cubic root of 18682889 is about 265.3473030293.

The spelling of 18682889 in words is "eighteen million, six hundred eighty-two thousand, eight hundred eighty-nine".