870505 has 4 divisors (see below), whose sum is σ = 1044612. Its totient is φ = 696400.

The previous prime is 870497. The next prime is 870517. The reversal of 870505 is 505078.

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 316969 + 553536 = 563^2 + 744^2 .

It is not a de Polignac number, because 870505 - 2³ = 870497 is a prime.

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

It is a Duffinian number.

870505 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 870505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87046 + ... + 87055.

It is an arithmetic number, because the mean of its divisors is an integer number (261153).

2⁸⁷⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

870505 is a deficient number, since it is larger than the sum of its proper divisors (174107).

870505 is a wasteful number, since it uses less digits than its factorization.

870505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174106.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 870505 is about 933.0085744515. The cubic root of 870505 is about 95.4824945299.

The spelling of 870505 in words is "eight hundred seventy thousand, five hundred five".