18840836 has 24 divisors (see below), whose sum is σ = 38982720. Its totient is φ = 7795872.

The previous prime is 18840817. The next prime is 18840847. The reversal of 18840836 is 63804881.

It is a self number, because there is not a number n which added to its sum of digits gives 18840836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10790 + ... + 12413.

It is an arithmetic number, because the mean of its divisors is an integer number (1624280).

Almost surely, 2^18840836 is an apocalyptic number.

It is an amenable number.

18840836 is an abundant number, since it is smaller than the sum of its proper divisors (20141884).

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

18840836 is a wasteful number, since it uses less digits than its factorization.

18840836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23243 (or 23241 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 18840836 is about 4340.6031838905. The cubic root of 18840836 is about 266.0929631539.

The spelling of 18840836 in words is "eighteen million, eight hundred forty thousand, eight hundred thirty-six".