18844281 has 9 divisors (see below), whose sum is σ = 27238341. Its totient is φ = 12554172.

The previous prime is 18844207. The next prime is 18844283. The reversal of 18844281 is 18244881.

It is a happy number.

The square root of 18844281 is 4341.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18844281 - 2¹³ = 18836089 is a prime.

It is a super-2 number, since 2×18844281² = 710213852813922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18844283) 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, 12300 + ... + 13746.

Almost surely, 2^18844281 is an apocalyptic number.

18844281 is the 4341-st square number.

18844281 is the 2171-st centered octagonal number.

It is an amenable number.

18844281 is a deficient number, since it is larger than the sum of its proper divisors (8394060).

18844281 is an frugal number, since it uses more digits than its factorization.

18844281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900 (or 1450 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The cubic root of 18844281 is about 266.1091803111.

Multiplying 18844281 by its sum of digits (36), we get a square (678394116 = 26046²).

Multiplying 18844281 by its product of digits (16384), we get a square (308744699904 = 555648²).

The spelling of 18844281 in words is "eighteen million, eight hundred forty-four thousand, two hundred eighty-one".