870305 has 4 divisors (see below), whose sum is σ = 1044372. Its totient is φ = 696240.

The previous prime is 870301. The next prime is 870323. The reversal of 870305 is 503078.

870305 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: 503078 = 2 ⋅251539.

It can be written as a sum of positive squares in 2 ways, for example, as 350464 + 519841 = 592^2 + 721^2 .

It is not a de Polignac number, because 870305 - 2² = 870301 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 870305.

It is not an unprimeable number, because it can be changed into a prime (870301) 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, 87026 + ... + 87035.

It is an arithmetic number, because the mean of its divisors is an integer number (261093).

2⁸⁷⁰³⁰⁵ is an apocalyptic number.

It is an amenable number.

870305 is a deficient number, since it is larger than the sum of its proper divisors (174067).

870305 is a wasteful number, since it uses less digits than its factorization.

870305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174066.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 870305 is about 932.9013881435. The cubic root of 870305 is about 95.4751815482.

The spelling of 870305 in words is "eight hundred seventy thousand, three hundred five".