18023894 has 16 divisors (see below), whose sum is σ = 32524800. Its totient is φ = 7317864.

The previous prime is 18023849. The next prime is 18023909. The reversal of 18023894 is 49832081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33614 + ... + 34145.

It is an arithmetic number, because the mean of its divisors is an integer number (2032800).

Almost surely, 2^18023894 is an apocalyptic number.

18023894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18023894 is a deficient number, since it is larger than the sum of its proper divisors (14500906).

18023894 is a wasteful number, since it uses less digits than its factorization.

18023894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67787.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18023894 is about 4245.4556881447. The cubic root of 18023894 is about 262.1900511007.

The spelling of 18023894 in words is "eighteen million, twenty-three thousand, eight hundred ninety-four".