16858223 has 4 divisors (see below), whose sum is σ = 16871088. Its totient is φ = 16845360.

The previous prime is 16858217. The next prime is 16858243. The reversal of 16858223 is 32285861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32285861 = 3049 ⋅10589.

It is a cyclic number.

It is not a de Polignac number, because 16858223 - 2¹⁸ = 16596079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16858243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4211 + ... + 7172.

It is an arithmetic number, because the mean of its divisors is an integer number (4217772).

Almost surely, 2^16858223 is an apocalyptic number.

16858223 is a deficient number, since it is larger than the sum of its proper divisors (12865).

16858223 is a wasteful number, since it uses less digits than its factorization.

16858223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12864.

The product of its digits is 23040, while the sum is 35.

The square root of 16858223 is about 4105.8766420827. The cubic root of 16858223 is about 256.4113615454.

The spelling of 16858223 in words is "sixteen million, eight hundred fifty-eight thousand, two hundred twenty-three".