18464489 has 2 divisors, whose sum is σ = 18464490. Its totient is φ = 18464488.

The previous prime is 18464483. The next prime is 18464507. The reversal of 18464489 is 98446481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13446889 + 5017600 = 3667^2 + 2240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18464489 is a prime.

It is a super-2 number, since 2×18464489² = 681874708062242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18464483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9232244 + 9232245.

It is an arithmetic number, because the mean of its divisors is an integer number (9232245).

Almost surely, 2^18464489 is an apocalyptic number.

It is an amenable number.

18464489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18464489 is an equidigital number, since it uses as much as digits as its factorization.

18464489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 44.

The square root of 18464489 is about 4297.0325807469. The cubic root of 18464489 is about 264.3092918128.

The spelling of 18464489 in words is "eighteen million, four hundred sixty-four thousand, four hundred eighty-nine".