18844881 has 16 divisors (see below), whose sum is σ = 27518400. Its totient is φ = 11376320.

The previous prime is 18844873. The next prime is 18844909.

18844881 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 18844881 - 2³ = 18844873 is a prime.

It is a super-2 number, since 2×18844881² = 710259079808322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18844801) 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 15 ways as a sum of consecutive naturals, for example, 8695 + ... + 10643.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^18844881 is an apocalyptic number.

18844881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18844881 is a deficient number, since it is larger than the sum of its proper divisors (8673519).

18844881 is a wasteful number, since it uses less digits than its factorization.

18844881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256.

The product of its digits is 65536, while the sum is 42.

The square root of 18844881 is about 4341.0691079503. The cubic root of 18844881 is about 266.1120045775.

The spelling of 18844881 in words is "eighteen million, eight hundred forty-four thousand, eight hundred eighty-one".