878749 has 2 divisors, whose sum is σ = 878750. Its totient is φ = 878748.

The previous prime is 878743. The next prime is 878777. The reversal of 878749 is 947878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710649 + 168100 = 843^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 878749 - 2⁷ = 878621 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878743) 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 as a sum of consecutive naturals, namely, 439374 + 439375.

It is an arithmetic number, because the mean of its divisors is an integer number (439375).

2⁸⁷⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

878749 is a deficient number, since it is larger than the sum of its proper divisors (1).

878749 is an equidigital number, since it uses as much as digits as its factorization.

878749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 878749 is about 937.4161295817. The cubic root of 878749 is about 95.7829660136.

It can be divided in two parts, 8787 and 49, that added together give a square (8836 = 94²).

The spelling of 878749 in words is "eight hundred seventy-eight thousand, seven hundred forty-nine".