870829 has 4 divisors (see below), whose sum is σ = 873180. Its totient is φ = 868480.

The previous prime is 870823. The next prime is 870833. The reversal of 870829 is 928078.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 348100 + 522729 = 590^2 + 723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-870829 is a prime.

It is a super-5 number, since 5×870829⁵ (a number of 31 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 870794 and 870803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484 + ... + 1405.

It is an arithmetic number, because the mean of its divisors is an integer number (218295).

2⁸⁷⁰⁸²⁹ is an apocalyptic number.

It is an amenable number.

870829 is a deficient number, since it is larger than the sum of its proper divisors (2351).

870829 is a wasteful number, since it uses less digits than its factorization.

870829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 870829 is about 933.1821901430. The cubic root of 870829 is about 95.4943391837.

The spelling of 870829 in words is "eight hundred seventy thousand, eight hundred twenty-nine".