18398994 has 8 divisors (see below), whose sum is σ = 36798000. Its totient is φ = 6132996.

The previous prime is 18398983. The next prime is 18399001. The reversal of 18398994 is 49989381.

It is a happy number.

18398994 is nontrivially palindromic in base 13.

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

18398994 is an admirable 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, 1533244 + ... + 1533255.

It is an arithmetic number, because the mean of its divisors is an integer number (4599750).

Almost surely, 2^18398994 is an apocalyptic number.

18398994 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.

18398994 is a wasteful number, since it uses less digits than its factorization.

18398994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066504.

The product of its digits is 559872, while the sum is 51.

The square root of 18398994 is about 4289.4048538230. The cubic root of 18398994 is about 263.9964129448.

The spelling of 18398994 in words is "eighteen million, three hundred ninety-eight thousand, nine hundred ninety-four".