18211850 has 24 divisors (see below), whose sum is σ = 34069248. Its totient is φ = 7242800.

The previous prime is 18211819. The next prime is 18211859. The reversal of 18211850 is 5811281.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18211859) 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, 8597 + ... + 10503.

It is an arithmetic number, because the mean of its divisors is an integer number (1419552).

Almost surely, 2^18211850 is an apocalyptic number.

18211850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18211850 is a deficient number, since it is larger than the sum of its proper divisors (15857398).

18211850 is a wasteful number, since it uses less digits than its factorization.

18211850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2105 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18211850 is about 4267.5344169672. The cubic root of 18211850 is about 263.0982876575.

The spelling of 18211850 in words is "eighteen million, two hundred eleven thousand, eight hundred fifty".