16858 has 4 divisors (see below), whose sum is σ = 25290. Its totient is φ = 8428.

The previous prime is 16843. The next prime is 16871. The reversal of 16858 is 85861.

It is a happy number.

16858 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85861 = 19 ⋅4519.

It can be written as a sum of positive squares in only one way, i.e., 16129 + 729 = 127^2 + 27^2 .

It is a plaindrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4213 + ... + 4216.

2¹⁶⁸⁵⁸ is an apocalyptic number.

16858 is a deficient number, since it is larger than the sum of its proper divisors (8432).

16858 is an equidigital number, since it uses as much as digits as its factorization.

16858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8431.

The product of its digits is 1920, while the sum is 28.

The square root of 16858 is about 129.8383610494. The cubic root of 16858 is about 25.6410230940.

It can be divided in two parts, 1 and 6858, that added together give a cube (6859 = 19³).

The spelling of 16858 in words is "sixteen thousand, eight hundred fifty-eight".