18208223 has 16 divisors (see below), whose sum is σ = 20805120. Its totient is φ = 15787200.

The previous prime is 18208189. The next prime is 18208231. The reversal of 18208223 is 32280281.

It is not a de Polignac number, because 18208223 - 2⁶ = 18208159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18208192 and 18208201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201223) 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, 20768 + ... + 21626.

It is an arithmetic number, because the mean of its divisors is an integer number (1300320).

Almost surely, 2^18208223 is an apocalyptic number.

18208223 is a deficient number, since it is larger than the sum of its proper divisors (2596897).

18208223 is a wasteful number, since it uses less digits than its factorization.

18208223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18208223 is about 4267.1094431711. The cubic root of 18208223 is about 263.0808206265.

The spelling of 18208223 in words is "eighteen million, two hundred eight thousand, two hundred twenty-three".