18213850 has 24 divisors (see below), whose sum is σ = 34266780. Its totient is φ = 7201920.

The previous prime is 18213829. The next prime is 18213857. The reversal of 18213850 is 5831281.

It can be written as a sum of positive squares in 6 ways, for example, as 3229209 + 14984641 = 1797^2 + 3871^2 .

It is not an unprimeable number, because it can be changed into a prime (18213857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2404 + ... + 6496.

Almost surely, 2^18213850 is an apocalyptic number.

18213850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18213850 is a deficient number, since it is larger than the sum of its proper divisors (16052930).

18213850 is a wasteful number, since it uses less digits than its factorization.

18213850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194 (or 4189 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18213850 is about 4267.7687378770. The cubic root of 18213850 is about 263.1079183341.

It can be divided in two parts, 1821 and 3850, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 18213850 in words is "eighteen million, two hundred thirteen thousand, eight hundred fifty".