18380099 has 4 divisors (see below), whose sum is σ = 18435960. Its totient is φ = 18324240.

The previous prime is 18380071. The next prime is 18380107. The reversal of 18380099 is 99008381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18380099 - 2⁸ = 18379843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18380069) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27434 + ... + 28095.

It is an arithmetic number, because the mean of its divisors is an integer number (4608990).

Almost surely, 2^18380099 is an apocalyptic number.

18380099 is a deficient number, since it is larger than the sum of its proper divisors (55861).

18380099 is an equidigital number, since it uses as much as digits as its factorization.

18380099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55860.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18380099 is about 4287.2017680534. The cubic root of 18380099 is about 263.9060108870.

The spelling of 18380099 in words is "eighteen million, three hundred eighty thousand, ninety-nine".