18109444 has 6 divisors (see below), whose sum is σ = 31691534. Its totient is φ = 9054720.

The previous prime is 18109423. The next prime is 18109457. The reversal of 18109444 is 44490181.

It can be written as a sum of positive squares in only one way, i.e., 15116544 + 2992900 = 3888^2 + 1730^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2263677 + ... + 2263684.

Almost surely, 2^18109444 is an apocalyptic number.

It is an amenable number.

18109444 is a deficient number, since it is larger than the sum of its proper divisors (13582090).

18109444 is a wasteful number, since it uses less digits than its factorization.

18109444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527365 (or 4527363 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18109444 is about 4255.5192397638. The cubic root of 18109444 is about 262.6042228619.

The spelling of 18109444 in words is "eighteen million, one hundred nine thousand, four hundred forty-four".