878549 has 4 divisors (see below), whose sum is σ = 1004064. Its totient is φ = 753036.

The previous prime is 878539. The next prime is 878551. The reversal of 878549 is 945878.

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: 945878 = 2 ⋅472939.

It is a cyclic number.

It is not a de Polignac number, because 878549 - 2¹⁶ = 813013 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62747 + ... + 62760.

It is an arithmetic number, because the mean of its divisors is an integer number (251016).

2⁸⁷⁸⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

878549 is a deficient number, since it is larger than the sum of its proper divisors (125515).

878549 is a wasteful number, since it uses less digits than its factorization.

878549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125514.

The product of its digits is 80640, while the sum is 41.

The square root of 878549 is about 937.3094473012. The cubic root of 878549 is about 95.7756988467.

The spelling of 878549 in words is "eight hundred seventy-eight thousand, five hundred forty-nine".