18945145 has 4 divisors (see below), whose sum is σ = 22734180. Its totient is φ = 15156112.

The previous prime is 18945139. The next prime is 18945151. The reversal of 18945145 is 54154981.

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

It is an interprime number because it is at equal distance from previous prime (18945139) and next prime (18945151).

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 8602489 = 3216^2 + 2933^2 .

It is a cyclic number.

It is not a de Polignac number, because 18945145 - 2¹¹ = 18943097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894510 + ... + 1894519.

It is an arithmetic number, because the mean of its divisors is an integer number (5683545).

Almost surely, 2^18945145 is an apocalyptic number.

It is an amenable number.

18945145 is a deficient number, since it is larger than the sum of its proper divisors (3789035).

18945145 is an equidigital number, since it uses as much as digits as its factorization.

18945145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789034.

The product of its digits is 28800, while the sum is 37.

The square root of 18945145 is about 4352.6020952989. The cubic root of 18945145 is about 266.5831187921.

The spelling of 18945145 in words is "eighteen million, nine hundred forty-five thousand, one hundred forty-five".