18549944 has 16 divisors (see below), whose sum is σ = 39750000. Its totient is φ = 7949952.

The previous prime is 18549943. The next prime is 18549959. The reversal of 18549944 is 44994581.

It is a junction number, because it is equal to n+sod(n) for n = 18549895 and 18549904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18549943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165569 + ... + 165680.

It is an arithmetic number, because the mean of its divisors is an integer number (2484375).

Almost surely, 2^18549944 is an apocalyptic number.

18549944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18549944 is an abundant number, since it is smaller than the sum of its proper divisors (21200056).

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

18549944 is a wasteful number, since it uses less digits than its factorization.

18549944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331262 (or 331258 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 18549944 is about 4306.9645923783. The cubic root of 18549944 is about 264.7164119481.

The spelling of 18549944 in words is "eighteen million, five hundred forty-nine thousand, nine hundred forty-four".