858166 has 4 divisors (see below), whose sum is σ = 1287252. Its totient is φ = 429082.

The previous prime is 858161. The next prime is 858167. The reversal of 858166 is 661858.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858161) by changing a digit.

858166 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214540 + ... + 214543.

It is an arithmetic number, because the mean of its divisors is an integer number (321813).

2⁸⁵⁸¹⁶⁶ is an apocalyptic number.

858166 is a deficient number, since it is larger than the sum of its proper divisors (429086).

858166 is a wasteful number, since it uses less digits than its factorization.

858166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429085.

The product of its digits is 11520, while the sum is 34.

The square root of 858166 is about 926.3724952739. The cubic root of 858166 is about 95.0292061633.

It can be divided in two parts, 858 and 166, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 858166 in words is "eight hundred fifty-eight thousand, one hundred sixty-six".