870869 has 4 divisors (see below), whose sum is σ = 894444. Its totient is φ = 847296.

The previous prime is 870853. The next prime is 870871. The reversal of 870869 is 968078.

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 555025 + 315844 = 745^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 870869 - 2⁴ = 870853 is a prime.

It is a super-2 number, since 2×870869² = 1516825630322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian 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.

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, 11732 + ... + 11805.

It is an arithmetic number, because the mean of its divisors is an integer number (223611).

2⁸⁷⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

870869 is a deficient number, since it is larger than the sum of its proper divisors (23575).

870869 is a wasteful number, since it uses less digits than its factorization.

870869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23574.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 870869 is about 933.2036219390. The cubic root of 870869 is about 95.4958012828.

The spelling of 870869 in words is "eight hundred seventy thousand, eight hundred sixty-nine".