18216873 has 8 divisors (see below), whose sum is σ = 26988000. Its totient is φ = 12144564.

The previous prime is 18216859. The next prime is 18216881. The reversal of 18216873 is 37861281.

It is not a de Polignac number, because 18216873 - 2⁹ = 18216361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18216823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337323 + ... + 337376.

It is an arithmetic number, because the mean of its divisors is an integer number (3373500).

Almost surely, 2^18216873 is an apocalyptic number.

It is an amenable number.

18216873 is a deficient number, since it is larger than the sum of its proper divisors (8771127).

18216873 is an equidigital number, since it uses as much as digits as its factorization.

18216873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674708 (or 674702 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18216873 is about 4268.1228895148. The cubic root of 18216873 is about 263.1224737638.

The spelling of 18216873 in words is "eighteen million, two hundred sixteen thousand, eight hundred seventy-three".