18039894 has 8 divisors (see below), whose sum is σ = 36079800. Its totient is φ = 6013296.

The previous prime is 18039883. The next prime is 18039929. The reversal of 18039894 is 49893081.

It is a sphenic number, since it is the product of 3 distinct primes.

18039894 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1503319 + ... + 1503330.

It is an arithmetic number, because the mean of its divisors is an integer number (4509975).

Almost surely, 2^18039894 is an apocalyptic number.

18039894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18039894 is a wasteful number, since it uses less digits than its factorization.

18039894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006654.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18039894 is about 4247.3396379381. The cubic root of 18039894 is about 262.2676111090.

The spelling of 18039894 in words is "eighteen million, thirty-nine thousand, eight hundred ninety-four".