878042447 has 2 divisors, whose sum is σ = 878042448. Its totient is φ = 878042446.

The previous prime is 878042443. The next prime is 878042489. The reversal of 878042447 is 744240878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 878042447 - 2² = 878042443 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 878042398 and 878042407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878042443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439021223 + 439021224.

It is an arithmetic number, because the mean of its divisors is an integer number (439021224).

Almost surely, 2^878042447 is an apocalyptic number.

878042447 is a deficient number, since it is larger than the sum of its proper divisors (1).

878042447 is an equidigital number, since it uses as much as digits as its factorization.

878042447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 401408, while the sum is 44.

The square root of 878042447 is about 29631.7810298335. The cubic root of 878042447 is about 957.5728788545.

The spelling of 878042447 in words is "eight hundred seventy-eight million, forty-two thousand, four hundred forty-seven".