18320806 has 12 divisors (see below), whose sum is σ = 31968108. Its totient is φ = 7851732.

The previous prime is 18320791. The next prime is 18320821. The reversal of 18320806 is 60802381.

It is an interprime number because it is at equal distance from previous prime (18320791) and next prime (18320821).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93376 + ... + 93571.

It is an arithmetic number, because the mean of its divisors is an integer number (2664009).

Almost surely, 2^18320806 is an apocalyptic number.

18320806 is a deficient number, since it is larger than the sum of its proper divisors (13647302).

18320806 is a wasteful number, since it uses less digits than its factorization.

18320806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186963 (or 186956 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18320806 is about 4280.2810655376. The cubic root of 18320806 is about 263.6219239956.

The spelling of 18320806 in words is "eighteen million, three hundred twenty thousand, eight hundred six".