18119823 has 4 divisors (see below), whose sum is σ = 24159768. Its totient is φ = 12079880.

The previous prime is 18119819. The next prime is 18119851. The reversal of 18119823 is 32891181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18119823 - 2² = 18119819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18119323) 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 3 ways as a sum of consecutive naturals, for example, 3019968 + ... + 3019973.

It is an arithmetic number, because the mean of its divisors is an integer number (6039942).

Almost surely, 2^18119823 is an apocalyptic number.

18119823 is a deficient number, since it is larger than the sum of its proper divisors (6039945).

18119823 is an equidigital number, since it uses as much as digits as its factorization.

18119823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039944.

The product of its digits is 3456, while the sum is 33.

The square root of 18119823 is about 4256.7385402442. The cubic root of 18119823 is about 262.6543817494.

The spelling of 18119823 in words is "eighteen million, one hundred nineteen thousand, eight hundred twenty-three".