878609 has 2 divisors, whose sum is σ = 878610. Its totient is φ = 878608.

The previous prime is 878597. The next prime is 878621. The reversal of 878609 is 906878.

It is a balanced prime because it is at equal distance from previous prime (878597) and next prime (878621).

It can be written as a sum of positive squares in only one way, i.e., 494209 + 384400 = 703^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 878609 - 2⁴ = 878593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (878629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439304 + 439305.

It is an arithmetic number, because the mean of its divisors is an integer number (439305).

2⁸⁷⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

878609 is a deficient number, since it is larger than the sum of its proper divisors (1).

878609 is an equidigital number, since it uses as much as digits as its factorization.

878609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 878609 is about 937.3414532602. The cubic root of 878609 is about 95.7778791126. Note that the first 3 decimals are identical.

The spelling of 878609 in words is "eight hundred seventy-eight thousand, six hundred nine".