18078994 has 8 divisors (see below), whose sum is σ = 28545840. Its totient is φ = 8563716.

The previous prime is 18078947. The next prime is 18079031. The reversal of 18078994 is 49987081.

It is a happy number.

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

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, 237844 + ... + 237919.

It is an arithmetic number, because the mean of its divisors is an integer number (3568230).

Almost surely, 2^18078994 is an apocalyptic number.

18078994 is a deficient number, since it is larger than the sum of its proper divisors (10466846).

18078994 is a wasteful number, since it uses less digits than its factorization.

18078994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475784.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18078994 is about 4251.9400277991. The cubic root of 18078994 is about 262.4569556026.

It can be divided in two parts, 1807 and 8994, that added together give a palindrome (10801).

The spelling of 18078994 in words is "eighteen million, seventy-eight thousand, nine hundred ninety-four".