18786445 has 12 divisors (see below), whose sum is σ = 23949684. Its totient is φ = 14144000.

The previous prime is 18786431. The next prime is 18786451. The reversal of 18786445 is 54468781.

It can be written as a sum of positive squares in 6 ways, for example, as 236196 + 18550249 = 486^2 + 4307^2 .

It is not a de Polignac number, because 18786445 - 2⁵ = 18786413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5056 + ... + 7945.

It is an arithmetic number, because the mean of its divisors is an integer number (1995807).

Almost surely, 2^18786445 is an apocalyptic number.

It is an amenable number.

18786445 is a deficient number, since it is larger than the sum of its proper divisors (5163239).

18786445 is a wasteful number, since it uses less digits than its factorization.

18786445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13040 (or 13023 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 18786445 is about 4334.3332820631. Note that the first 3 decimals coincide. The cubic root of 18786445 is about 265.8366579665.

The spelling of 18786445 in words is "eighteen million, seven hundred eighty-six thousand, four hundred forty-five".