18640286 has 12 divisors (see below), whose sum is σ = 32525568. Its totient is φ = 7988652.

The previous prime is 18640277. The next prime is 18640289. The reversal of 18640286 is 68204681.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95006 + ... + 95201.

It is an arithmetic number, because the mean of its divisors is an integer number (2710464).

Almost surely, 2^18640286 is an apocalyptic number.

18640286 is a deficient number, since it is larger than the sum of its proper divisors (13885282).

18640286 is a wasteful number, since it uses less digits than its factorization.

18640286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190223 (or 190216 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 18640286 is about 4317.4397505929. The cubic root of 18640286 is about 265.1454571093.

The spelling of 18640286 in words is "eighteen million, six hundred forty thousand, two hundred eighty-six".