18165044 has 12 divisors (see below), whose sum is σ = 33658884. Its totient is φ = 8548224.

The previous prime is 18165031. The next prime is 18165047. The reversal of 18165044 is 44056181.

It can be written as a sum of positive squares in 2 ways, for example, as 14212900 + 3952144 = 3770^2 + 1988^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18164998 and 18165016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18165047) 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, 133499 + ... + 133634.

It is an arithmetic number, because the mean of its divisors is an integer number (2804907).

Almost surely, 2^18165044 is an apocalyptic number.

It is an amenable number.

18165044 is a deficient number, since it is larger than the sum of its proper divisors (15493840).

18165044 is a wasteful number, since it uses less digits than its factorization.

18165044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267154 (or 267152 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 18165044 is about 4262.0469260673. The cubic root of 18165044 is about 262.8726993111.

It can be divided in two parts, 18 and 165044, that multiplied together give a palindrome (2970792).

The spelling of 18165044 in words is "eighteen million, one hundred sixty-five thousand, forty-four".