870806 has 4 divisors (see below), whose sum is σ = 1306212. Its totient is φ = 435402.

The previous prime is 870787. The next prime is 870809. The reversal of 870806 is 608078.

870806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608078 = 2 ⋅304039.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870809) by changing a digit.

870806 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, 217700 + ... + 217703.

It is an arithmetic number, because the mean of its divisors is an integer number (326553).

2⁸⁷⁰⁸⁰⁶ is an apocalyptic number.

870806 is a deficient number, since it is larger than the sum of its proper divisors (435406).

870806 is a wasteful number, since it uses less digits than its factorization.

870806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435405.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 870806 is about 933.1698666374. The cubic root of 870806 is about 95.4934984564.

The spelling of 870806 in words is "eight hundred seventy thousand, eight hundred six".