18009850 has 12 divisors (see below), whose sum is σ = 33498414. Its totient is φ = 7203920.

The previous prime is 18009833. The next prime is 18009857. The reversal of 18009850 is 5890081.

It can be written as a sum of positive squares in 3 ways, for example, as 11512449 + 6497401 = 3393^2 + 2549^2 .

It is not an unprimeable number, because it can be changed into a prime (18009857) 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, 180049 + ... + 180148.

Almost surely, 2^18009850 is an apocalyptic number.

18009850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18009850 is a deficient number, since it is larger than the sum of its proper divisors (15488564).

18009850 is a wasteful number, since it uses less digits than its factorization.

18009850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360209 (or 360204 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 18009850 is about 4243.8013619867. The cubic root of 18009850 is about 262.1219349680.

The spelling of 18009850 in words is "eighteen million, nine thousand, eight hundred fifty".