18105844 has 6 divisors (see below), whose sum is σ = 31685234. Its totient is φ = 9052920.

The previous prime is 18105827. The next prime is 18105847. The reversal of 18105844 is 44850181.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 3283344 = 3850^2 + 1812^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18105847) 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 as a sum of consecutive naturals, namely, 2263227 + ... + 2263234.

Almost surely, 2^18105844 is an apocalyptic number.

It is an amenable number.

18105844 is a deficient number, since it is larger than the sum of its proper divisors (13579390).

18105844 is a wasteful number, since it uses less digits than its factorization.

18105844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4526465 (or 4526463 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 18105844 is about 4255.0962386296. The cubic root of 18105844 is about 262.5868205633.

The spelling of 18105844 in words is "eighteen million, one hundred five thousand, eight hundred forty-four".