878345999 has 2 divisors, whose sum is σ = 878346000. Its totient is φ = 878345998.

The previous prime is 878345957. The next prime is 878346013. The reversal of 878345999 is 999543878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 878345999 - 2²⁴ = 861568783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878345399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439172999 + 439173000.

It is an arithmetic number, because the mean of its divisors is an integer number (439173000).

Almost surely, 2^878345999 is an apocalyptic number.

878345999 is a deficient number, since it is larger than the sum of its proper divisors (1).

878345999 is an equidigital number, since it uses as much as digits as its factorization.

878345999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 62.

The square root of 878345999 is about 29636.9026553046. The cubic root of 878345999 is about 957.6832150815.

The spelling of 878345999 in words is "eight hundred seventy-eight million, three hundred forty-five thousand, nine hundred ninety-nine".