878423879 has 2 divisors, whose sum is σ = 878423880. Its totient is φ = 878423878.

The previous prime is 878423849. The next prime is 878423899. The reversal of 878423879 is 978324878.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878423879 is a prime.

It is a super-2 number, since 2×878423879² = 1543257022394813282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878423809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439211939 + 439211940.

It is an arithmetic number, because the mean of its divisors is an integer number (439211940).

Almost surely, 2^878423879 is an apocalyptic number.

878423879 is a deficient number, since it is larger than the sum of its proper divisors (1).

878423879 is an equidigital number, since it uses as much as digits as its factorization.

878423879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 56.

The square root of 878423879 is about 29638.2165286645. The cubic root of 878423879 is about 957.7115191001.

Subtracting 878423879 from its reverse (978324878), we obtain a palindrome (99900999).

The spelling of 878423879 in words is "eight hundred seventy-eight million, four hundred twenty-three thousand, eight hundred seventy-nine".