18111930 has 16 divisors (see below), whose sum is σ = 43468704. Its totient is φ = 4829840.

The previous prime is 18111923. The next prime is 18111931. The reversal of 18111930 is 3911181.

It is a self number, because there is not a number n which added to its sum of digits gives 18111930.

It is not an unprimeable number, because it can be changed into a prime (18111931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301836 + ... + 301895.

It is an arithmetic number, because the mean of its divisors is an integer number (2716794).

Almost surely, 2^18111930 is an apocalyptic number.

18111930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18111930 is an abundant number, since it is smaller than the sum of its proper divisors (25356774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18111930 is a wasteful number, since it uses less digits than its factorization.

18111930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603741.

The product of its (nonzero) digits is 216, while the sum is 24.

The square root of 18111930 is about 4255.8113210057. The cubic root of 18111930 is about 262.6162387696.

It can be divided in two parts, 1811 and 1930, that added together give a triangular number (3741 = T₈₆).

The spelling of 18111930 in words is "eighteen million, one hundred eleven thousand, nine hundred thirty".