18445705 has 4 divisors (see below), whose sum is σ = 22134852. Its totient is φ = 14756560.

The previous prime is 18445699. The next prime is 18445709. The reversal of 18445705 is 50754481.

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 2732409 + 15713296 = 1653^2 + 3964^2 .

It is not a de Polignac number, because 18445705 - 2⁵ = 18445673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18445709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844566 + ... + 1844575.

It is an arithmetic number, because the mean of its divisors is an integer number (5533713).

Almost surely, 2^18445705 is an apocalyptic number.

It is an amenable number.

18445705 is a deficient number, since it is larger than the sum of its proper divisors (3689147).

18445705 is an equidigital number, since it uses as much as digits as its factorization.

18445705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689146.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 18445705 is about 4294.8463301962. The cubic root of 18445705 is about 264.2196337625.

The spelling of 18445705 in words is "eighteen million, four hundred forty-five thousand, seven hundred five".