878440 has 16 divisors (see below), whose sum is σ = 1976580. Its totient is φ = 351360.

The previous prime is 878419. The next prime is 878443. The reversal of 878440 is 44878.

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 6084 = 934^2 + 78^2 .

It is not an unprimeable number, because it can be changed into a prime (878443) 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, 10941 + ... + 11020.

2⁸⁷⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

878440 is an abundant number, since it is smaller than the sum of its proper divisors (1098140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

878440 is a wasteful number, since it uses less digits than its factorization.

878440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21972 (or 21968 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 878440 is about 937.2513003459. The cubic root of 878440 is about 95.7717377765.

The spelling of 878440 in words is "eight hundred seventy-eight thousand, four hundred forty".