18774889 has 9 divisors (see below), whose sum is σ = 21875517. Its totient is φ = 16066764.

The previous prime is 18774881. The next prime is 18774893. The reversal of 18774889 is 98847781.

The square root of 18774889 is 4333.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 18774889 - 2³ = 18774881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18774881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 30022 + ... + 30640.

It is an arithmetic number, because the mean of its divisors is an integer number (2430613).

Almost surely, 2^18774889 is an apocalyptic number.

18774889 is the 4333-rd square number.

18774889 is the 2167-th centered octagonal number.

It is an amenable number.

18774889 is a deficient number, since it is larger than the sum of its proper divisors (3100628).

18774889 is an frugal number, since it uses more digits than its factorization.

18774889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 626 counting only the distinct ones).

The product of its digits is 903168, while the sum is 52.

The cubic root of 18774889 is about 265.7821392514.

It can be divided in two parts, 187 and 74889, that added together give a square (75076 = 274²).

The spelling of 18774889 in words is "eighteen million, seven hundred seventy-four thousand, eight hundred eighty-nine".