18244081 has 4 divisors (see below), whose sum is σ = 18421312. Its totient is φ = 18066852.

The previous prime is 18244067. The next prime is 18244117. The reversal of 18244081 is 18044281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18044281 = 19 ⋅949699.

It is a cyclic number.

It is not a de Polignac number, because 18244081 - 2⁵ = 18244049 is a prime.

It is a super-2 number, since 2×18244081² = 665692983069122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18244001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88461 + ... + 88666.

It is an arithmetic number, because the mean of its divisors is an integer number (4605328).

Almost surely, 2^18244081 is an apocalyptic number.

It is an amenable number.

18244081 is a deficient number, since it is larger than the sum of its proper divisors (177231).

18244081 is a wasteful number, since it uses less digits than its factorization.

18244081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177230.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 18244081 is about 4271.3090499284. The cubic root of 18244081 is about 263.2534050359.

The spelling of 18244081 in words is "eighteen million, two hundred forty-four thousand, eighty-one".