816858 has 32 divisors (see below), whose sum is σ = 2075520. Its totient is φ = 233280.

The previous prime is 816857. The next prime is 816859. The reversal of 816858 is 858618.

It is an interprime number because it is at equal distance from previous prime (816857) and next prime (816859).

It is not an unprimeable number, because it can be changed into a prime (816857) 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, 703 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (64860).

2⁸¹⁶⁸⁵⁸ is an apocalyptic number.

816858 is an abundant number, since it is smaller than the sum of its proper divisors (1258662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816858 is a wasteful number, since it uses less digits than its factorization.

816858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179 (or 2173 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 816858 is about 903.8019694601. The cubic root of 816858 is about 93.4793152028.

The spelling of 816858 in words is "eight hundred sixteen thousand, eight hundred fifty-eight".