18421044 has 24 divisors (see below), whose sum is σ = 43054368. Its totient is φ = 6130080.

The previous prime is 18421043. The next prime is 18421057. The reversal of 18421044 is 44012481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421043) 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, 10554 + ... + 12174.

It is an arithmetic number, because the mean of its divisors is an integer number (1793932).

Almost surely, 2^18421044 is an apocalyptic number.

It is an amenable number.

18421044 is an abundant number, since it is smaller than the sum of its proper divisors (24633324).

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

18421044 is a wasteful number, since it uses less digits than its factorization.

18421044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575 (or 2573 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 18421044 is about 4291.9743708461. The cubic root of 18421044 is about 264.1018316984.

The spelling of 18421044 in words is "eighteen million, four hundred twenty-one thousand, forty-four".