18401844 has 12 divisors (see below), whose sum is σ = 42937664. Its totient is φ = 6133944.

The previous prime is 18401843. The next prime is 18401849. The reversal of 18401844 is 44810481.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401843) 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, 766732 + ... + 766755.

Almost surely, 2^18401844 is an apocalyptic number.

It is an amenable number.

18401844 is an abundant number, since it is smaller than the sum of its proper divisors (24535820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18401844 is a wasteful number, since it uses less digits than its factorization.

18401844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533494 (or 1533492 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 18401844 is about 4289.7370548788. The cubic root of 18401844 is about 264.0100432359.

The spelling of 18401844 in words is "eighteen million, four hundred one thousand, eight hundred forty-four".