878155 has 4 divisors (see below), whose sum is σ = 1053792. Its totient is φ = 702520.

The previous prime is 878153. The next prime is 878159. The reversal of 878155 is 551878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551878 = 2 ⋅275939.

It is not a de Polignac number, because 878155 - 2¹ = 878153 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 878155.

It is not an unprimeable number, because it can be changed into a prime (878153) 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, 87811 + ... + 87820.

It is an arithmetic number, because the mean of its divisors is an integer number (263448).

2⁸⁷⁸¹⁵⁵ is an apocalyptic number.

878155 is a deficient number, since it is larger than the sum of its proper divisors (175637).

878155 is a wasteful number, since it uses less digits than its factorization.

878155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175636.

The product of its digits is 11200, while the sum is 34.

The square root of 878155 is about 937.0992476787. The cubic root of 878155 is about 95.7613793010.

It can be divided in two parts, 8781 and 55, that added together give a square (8836 = 94²).

The spelling of 878155 in words is "eight hundred seventy-eight thousand, one hundred fifty-five".