18388850 has 12 divisors (see below), whose sum is σ = 34203354. Its totient is φ = 7355520.

The previous prime is 18388831. The next prime is 18388873. The reversal of 18388850 is 5888381.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16008001 + 2380849 = 4001^2 + 1543^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18388798 and 18388807.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183839 + ... + 183938.

Almost surely, 2^18388850 is an apocalyptic number.

18388850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18388850 is a deficient number, since it is larger than the sum of its proper divisors (15814504).

18388850 is a wasteful number, since it uses less digits than its factorization.

18388850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367789 (or 367784 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The square root of 18388850 is about 4288.2222423750. Note that the first 4 decimals coincide. The cubic root of 18388850 is about 263.9478872498.

The spelling of 18388850 in words is "eighteen million, three hundred eighty-eight thousand, eight hundred fifty".