18643089 has 4 divisors (see below), whose sum is σ = 24857456. Its totient is φ = 12428724.

The previous prime is 18643081. The next prime is 18643111. The reversal of 18643089 is 98034681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18643089 - 2³ = 18643081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18643081) 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 in 3 ways as a sum of consecutive naturals, for example, 3107179 + ... + 3107184.

It is an arithmetic number, because the mean of its divisors is an integer number (6214364).

Almost surely, 2^18643089 is an apocalyptic number.

It is an amenable number.

18643089 is a deficient number, since it is larger than the sum of its proper divisors (6214367).

18643089 is an equidigital number, since it uses as much as digits as its factorization.

18643089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6214366.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18643089 is about 4317.7643520693. The cubic root of 18643089 is about 265.1587467027.

The spelling of 18643089 in words is "eighteen million, six hundred forty-three thousand, eighty-nine".