18111982 has 16 divisors (see below), whose sum is σ = 31108320. Its totient is φ = 7747488.

The previous prime is 18111949. The next prime is 18112001. The reversal of 18111982 is 28911181.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9744 + ... + 11452.

It is an arithmetic number, because the mean of its divisors is an integer number (1944270).

Almost surely, 2^18111982 is an apocalyptic number.

18111982 is a deficient number, since it is larger than the sum of its proper divisors (12996338).

18111982 is a wasteful number, since it uses less digits than its factorization.

18111982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475.

The product of its digits is 1152, while the sum is 31.

The square root of 18111982 is about 4255.8174302947. The cubic root of 18111982 is about 262.6164900963.

The spelling of 18111982 in words is "eighteen million, one hundred eleven thousand, nine hundred eighty-two".