18888965 has 4 divisors (see below), whose sum is σ = 22666764. Its totient is φ = 15111168.

The previous prime is 18888959. The next prime is 18888973. The reversal of 18888965 is 56988881.

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 10233601 + 8655364 = 3199^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 18888965 - 2⁴ = 18888949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888892 + ... + 1888901.

It is an arithmetic number, because the mean of its divisors is an integer number (5666691).

Almost surely, 2^18888965 is an apocalyptic number.

It is an amenable number.

18888965 is a deficient number, since it is larger than the sum of its proper divisors (3777799).

18888965 is an equidigital number, since it uses as much as digits as its factorization.

18888965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777798.

The product of its digits is 1105920, while the sum is 53.

The square root of 18888965 is about 4346.1436929766. The cubic root of 18888965 is about 266.3193490509.

The spelling of 18888965 in words is "eighteen million, eight hundred eighty-eight thousand, nine hundred sixty-five".