18505445 has 16 divisors (see below), whose sum is σ = 25608960. Its totient is φ = 12574464.

The previous prime is 18505441. The next prime is 18505447. The reversal of 18505445 is 54450581.

It is not a de Polignac number, because 18505445 - 2² = 18505441 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18505441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1616 + ... + 6294.

It is an arithmetic number, because the mean of its divisors is an integer number (1600560).

Almost surely, 2^18505445 is an apocalyptic number.

It is an amenable number.

18505445 is a deficient number, since it is larger than the sum of its proper divisors (7103515).

18505445 is a wasteful number, since it uses less digits than its factorization.

18505445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804.

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 18505445 is about 4301.7955553466. The cubic root of 18505445 is about 264.5045685869.

The spelling of 18505445 in words is "eighteen million, five hundred five thousand, four hundred forty-five".