18844489 has 2 divisors, whose sum is σ = 18844490. Its totient is φ = 18844488.

The previous prime is 18844471. The next prime is 18844493. The reversal of 18844489 is 98444881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 824464 = 4245^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844489 - 2⁵ = 18844457 is a prime.

It is a super-2 number, since 2×18844489² = 710229531342242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18844459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422244 + 9422245.

It is an arithmetic number, because the mean of its divisors is an integer number (9422245).

Almost surely, 2^18844489 is an apocalyptic number.

It is an amenable number.

18844489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844489 is an equidigital number, since it uses as much as digits as its factorization.

18844489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294912, while the sum is 46.

The square root of 18844489 is about 4341.0239575473. The cubic root of 18844489 is about 266.1101593969.

The spelling of 18844489 in words is "eighteen million, eight hundred forty-four thousand, four hundred eighty-nine".