18022873 has 16 divisors (see below), whose sum is σ = 21496320. Its totient is φ = 14918400.

The previous prime is 18022867. The next prime is 18022883. The reversal of 18022873 is 37822081.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18022873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18022843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4243 + ... + 7351.

It is an arithmetic number, because the mean of its divisors is an integer number (1343520).

Almost surely, 2^18022873 is an apocalyptic number.

It is an amenable number.

18022873 is a deficient number, since it is larger than the sum of its proper divisors (3473447).

18022873 is a wasteful number, since it uses less digits than its factorization.

18022873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18022873 is about 4245.3354402214. The cubic root of 18022873 is about 262.1851002450.

The spelling of 18022873 in words is "eighteen million, twenty-two thousand, eight hundred seventy-three".