870217 has 4 divisors (see below), whose sum is σ = 873936. Its totient is φ = 866500.

The previous prime is 870211. The next prime is 870223. The reversal of 870217 is 712078.

It is a happy number.

870217 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712078 = 2 ⋅356039.

It is an interprime number because it is at equal distance from previous prime (870211) and next prime (870223).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-870217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 870191 and 870200.

It is not an unprimeable number, because it can be changed into a prime (870211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483 + ... + 1984.

It is an arithmetic number, because the mean of its divisors is an integer number (218484).

2⁸⁷⁰²¹⁷ is an apocalyptic number.

It is an amenable number.

870217 is a deficient number, since it is larger than the sum of its proper divisors (3719).

870217 is a wasteful number, since it uses less digits than its factorization.

870217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 870217 is about 932.8542222663. The cubic root of 870217 is about 95.4719634813.

It can be divided in two parts, 8 and 70217, that added together give a square (70225 = 265²).

The spelling of 870217 in words is "eight hundred seventy thousand, two hundred seventeen".