878245 has 4 divisors (see below), whose sum is σ = 1053900. Its totient is φ = 702592.

The previous prime is 878239. The next prime is 878279. The reversal of 878245 is 542878.

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 509796 + 368449 = 714^2 + 607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878245 is a prime.

878245 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 878245.

It is a congruent number.

It is an unprimeable number.

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, 87820 + ... + 87829.

It is an arithmetic number, because the mean of its divisors is an integer number (263475).

2⁸⁷⁸²⁴⁵ is an apocalyptic number.

It is an amenable number.

878245 is a deficient number, since it is larger than the sum of its proper divisors (175655).

878245 is a wasteful number, since it uses less digits than its factorization.

878245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175654.

The product of its digits is 17920, while the sum is 34.

The square root of 878245 is about 937.1472669757. The cubic root of 878245 is about 95.7646506406.

The spelling of 878245 in words is "eight hundred seventy-eight thousand, two hundred forty-five".