18181044 has 48 divisors (see below), whose sum is σ = 53872000. Its totient is φ = 5194368.

The previous prime is 18181039. The next prime is 18181103. The reversal of 18181044 is 44018181.

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

It is a junction number, because it is equal to n+sod(n) for n = 18180999 and 18181017.

It is a congruent number.

It is an unprimeable number.

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, 11269 + ... + 12780.

Almost surely, 2^18181044 is an apocalyptic number.

18181044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18181044 is an abundant number, since it is smaller than the sum of its proper divisors (35690956).

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

18181044 is a wasteful number, since it uses less digits than its factorization.

18181044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24069 (or 24061 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 18181044 is about 4263.9235452808. The cubic root of 18181044 is about 262.9498571920.

It can be divided in two parts, 181 and 81044, that added together give a square (81225 = 285²).

The spelling of 18181044 in words is "eighteen million, one hundred eighty-one thousand, forty-four".