18382111 has 4 divisors (see below), whose sum is σ = 20053224. Its totient is φ = 16711000.

The previous prime is 18382097. The next prime is 18382121. The reversal of 18382111 is 11128381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11128381 = 11 ⋅1011671.

It is a cyclic number.

It is not a de Polignac number, because 18382111 - 2⁵ = 18382079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18382121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835540 + ... + 835561.

It is an arithmetic number, because the mean of its divisors is an integer number (5013306).

Almost surely, 2^18382111 is an apocalyptic number.

18382111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18382111 is a deficient number, since it is larger than the sum of its proper divisors (1671113).

18382111 is a wasteful number, since it uses less digits than its factorization.

18382111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671112.

The product of its digits is 384, while the sum is 25.

The square root of 18382111 is about 4287.4364135227. The cubic root of 18382111 is about 263.9156401336.

It can be divided in two parts, 18382 and 111, that multiplied together give a palindrome (2040402).

The spelling of 18382111 in words is "eighteen million, three hundred eighty-two thousand, one hundred eleven".