18393894 has 24 divisors (see below), whose sum is σ = 40149720. Its totient is φ = 6085728.

The previous prime is 18393887. The next prime is 18393913. The reversal of 18393894 is 49839381.

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 11 ways as a sum of consecutive naturals, for example, 1264 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (1672905).

Almost surely, 2^18393894 is an apocalyptic number.

18393894 is an abundant number, since it is smaller than the sum of its proper divisors (21755826).

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

18393894 is a wasteful number, since it uses less digits than its factorization.

18393894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7604 (or 7601 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18393894 is about 4288.8103245539. The cubic root of 18393894 is about 263.9720183842.

The spelling of 18393894 in words is "eighteen million, three hundred ninety-three thousand, eight hundred ninety-four".