18344481 has 8 divisors (see below), whose sum is σ = 25746720. Its totient is φ = 11585952.

The previous prime is 18344477. The next prime is 18344497. The reversal of 18344481 is 18444381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18344481 - 2² = 18344477 is a prime.

It is a super-2 number, since 2×18344481² = 673039966318722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18344461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160860 + ... + 160973.

It is an arithmetic number, because the mean of its divisors is an integer number (3218340).

Almost surely, 2^18344481 is an apocalyptic number.

It is an amenable number.

18344481 is a deficient number, since it is larger than the sum of its proper divisors (7402239).

18344481 is a wasteful number, since it uses less digits than its factorization.

18344481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321855.

The product of its digits is 12288, while the sum is 33.

The square root of 18344481 is about 4283.0457620717. The cubic root of 18344481 is about 263.7354299656.

The spelling of 18344481 in words is "eighteen million, three hundred forty-four thousand, four hundred eighty-one".