18344489 has 4 divisors (see below), whose sum is σ = 18840324. Its totient is φ = 17848656.

The previous prime is 18344477. The next prime is 18344497. The reversal of 18344489 is 98444381.

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 16362025 + 1982464 = 4045^2 + 1408^2 .

It is a cyclic number.

It is not a de Polignac number, because 18344489 - 2²⁰ = 17295913 is a prime.

It is a super-2 number, since 2×18344489² = 673040553342242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18344419) 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 in 3 ways as a sum of consecutive naturals, for example, 247862 + ... + 247935.

It is an arithmetic number, because the mean of its divisors is an integer number (4710081).

Almost surely, 2^18344489 is an apocalyptic number.

It is an amenable number.

18344489 is a deficient number, since it is larger than the sum of its proper divisors (495835).

18344489 is an equidigital number, since it uses as much as digits as its factorization.

18344489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495834.

The product of its digits is 110592, while the sum is 41.

The square root of 18344489 is about 4283.0466959864. The cubic root of 18344489 is about 263.7354683038.

The spelling of 18344489 in words is "eighteen million, three hundred forty-four thousand, four hundred eighty-nine".