18108445 has 8 divisors (see below), whose sum is σ = 21954744. Its totient is φ = 14337024.

The previous prime is 18108439. The next prime is 18108449. The reversal of 18108445 is 54480181.

It can be written as a sum of positive squares in 4 ways, for example, as 2474329 + 15634116 = 1573^2 + 3954^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18108445 - 2⁵ = 18108413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18108449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18184 + ... + 19153.

It is an arithmetic number, because the mean of its divisors is an integer number (2744343).

Almost surely, 2^18108445 is an apocalyptic number.

It is an amenable number.

18108445 is a deficient number, since it is larger than the sum of its proper divisors (3846299).

18108445 is an equidigital number, since it uses as much as digits as its factorization.

18108445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37439.

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

The square root of 18108445 is about 4255.4018611642. The cubic root of 18108445 is about 262.5993939552.

The spelling of 18108445 in words is "eighteen million, one hundred eight thousand, four hundred forty-five".