878621 has 2 divisors, whose sum is σ = 878622. Its totient is φ = 878620.

The previous prime is 878609. The next prime is 878629. The reversal of 878621 is 126878.

878621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657721 + 220900 = 811^2 + 470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878621 is a prime.

It is a Chen prime.

It is a congruent number.

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, 439310 + 439311.

It is an arithmetic number, because the mean of its divisors is an integer number (439311).

2⁸⁷⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

878621 is a deficient number, since it is larger than the sum of its proper divisors (1).

878621 is an equidigital number, since it uses as much as digits as its factorization.

878621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 878621 is about 937.3478543209. The cubic root of 878621 is about 95.7783151538.

The spelling of 878621 in words is "eight hundred seventy-eight thousand, six hundred twenty-one".