18105245 has 4 divisors (see below), whose sum is σ = 21726300. Its totient is φ = 14484192.

The previous prime is 18105229. The next prime is 18105257. The reversal of 18105245 is 54250181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5410276 + 12694969 = 2326^2 + 3563^2 .

It is a cyclic number.

It is not a de Polignac number, because 18105245 - 2⁴ = 18105229 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1810520 + ... + 1810529.

It is an arithmetic number, because the mean of its divisors is an integer number (5431575).

Almost surely, 2^18105245 is an apocalyptic number.

It is an amenable number.

18105245 is a deficient number, since it is larger than the sum of its proper divisors (3621055).

18105245 is an equidigital number, since it uses as much as digits as its factorization.

18105245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621054.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 18105245 is about 4255.0258518604. The cubic root of 18105245 is about 262.5839247903.

The spelling of 18105245 in words is "eighteen million, one hundred five thousand, two hundred forty-five".