18086398 has 16 divisors (see below), whose sum is σ = 30015360. Its totient is φ = 8104600.

The previous prime is 18086357. The next prime is 18086417. The reversal of 18086398 is 89368081.

It is a happy number.

It is a super-2 number, since 2×18086398² = 654235585228808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4228 + ... + 7351.

It is an arithmetic number, because the mean of its divisors is an integer number (1875960).

Almost surely, 2^18086398 is an apocalyptic number.

18086398 is a deficient number, since it is larger than the sum of its proper divisors (11928962).

18086398 is a wasteful number, since it uses less digits than its factorization.

18086398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11663.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18086398 is about 4252.8106000620. The cubic root of 18086398 is about 262.4927792420.

The spelling of 18086398 in words is "eighteen million, eighty-six thousand, three hundred ninety-eight".