18985646 has 8 divisors (see below), whose sum is σ = 28509624. Its totient is φ = 9482440.

The previous prime is 18985643. The next prime is 18985657. The reversal of 18985646 is 64658981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18985646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985643) 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, 2660 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (3563703).

Almost surely, 2^18985646 is an apocalyptic number.

18985646 is a deficient number, since it is larger than the sum of its proper divisors (9523978).

18985646 is a wasteful number, since it uses less digits than its factorization.

18985646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10386.

The product of its digits is 414720, while the sum is 47.

The square root of 18985646 is about 4357.2521157261. The cubic root of 18985646 is about 266.7729510358.

The spelling of 18985646 in words is "eighteen million, nine hundred eighty-five thousand, six hundred forty-six".