18051444 has 72 divisors (see below), whose sum is σ = 49499520. Its totient is φ = 5688144.

The previous prime is 18051413. The next prime is 18051457. The reversal of 18051444 is 44415081.

It is a happy number.

It is a super-5 number, since 5×18051444⁵ (a number of 37 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38757 + ... + 39219.

Almost surely, 2^18051444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18051444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24749760).

18051444 is an abundant number, since it is smaller than the sum of its proper divisors (31448076).

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

18051444 is a wasteful number, since it uses less digits than its factorization.

18051444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 18051444 is about 4248.6990950172. The cubic root of 18051444 is about 262.3235712430.

It can be divided in two parts, 1805 and 1444, that added together give a square (3249 = 57²).

The spelling of 18051444 in words is "eighteen million, fifty-one thousand, four hundred forty-four".