18786444 has 24 divisors (see below), whose sum is σ = 43909488. Its totient is φ = 6251520.

The previous prime is 18786431. The next prime is 18786451. The reversal of 18786444 is 44468781.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18786396 and 18786405.

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 7 ways as a sum of consecutive naturals, for example, 9684 + ... + 11460.

It is an arithmetic number, because the mean of its divisors is an integer number (1829562).

Almost surely, 2^18786444 is an apocalyptic number.

It is an amenable number.

18786444 is an abundant number, since it is smaller than the sum of its proper divisors (25123044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18786444 is a wasteful number, since it uses less digits than its factorization.

18786444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665 (or 2663 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 18786444 is about 4334.3331667051. Note that the first 3 decimals coincide. The cubic root of 18786444 is about 265.8366532496.

The spelling of 18786444 in words is "eighteen million, seven hundred eighty-six thousand, four hundred forty-four".