18111850 has 12 divisors (see below), whose sum is σ = 33688134. Its totient is φ = 7244720.

The previous prime is 18111827. The next prime is 18111853. The reversal of 18111850 is 5811181.

It can be written as a sum of positive squares in 3 ways, for example, as 14722569 + 3389281 = 3837^2 + 1841^2 .

It is a super-2 number, since 2×18111850² = 656078220845000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (18111853) 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, 181069 + ... + 181168.

Almost surely, 2^18111850 is an apocalyptic number.

18111850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18111850 is a deficient number, since it is larger than the sum of its proper divisors (15576284).

18111850 is a wasteful number, since it uses less digits than its factorization.

18111850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362249 (or 362244 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 25.

The square root of 18111850 is about 4255.8019220824. The cubic root of 18111850 is about 262.6158521123.

The spelling of 18111850 in words is "eighteen million, one hundred eleven thousand, eight hundred fifty".