878266399 has 2 divisors, whose sum is σ = 878266400. Its totient is φ = 878266398.

The previous prime is 878266327. The next prime is 878266423. The reversal of 878266399 is 993662878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 878266399 - 2⁹ = 878265887 is a prime.

It is a super-2 number, since 2×878266399² = 1542703735224854402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878266999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439133199 + 439133200.

It is an arithmetic number, because the mean of its divisors is an integer number (439133200).

Almost surely, 2^878266399 is an apocalyptic number.

878266399 is a deficient number, since it is larger than the sum of its proper divisors (1).

878266399 is an equidigital number, since it uses as much as digits as its factorization.

878266399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 58.

The square root of 878266399 is about 29635.5597045171. The cubic root of 878266399 is about 957.6542842323.

The spelling of 878266399 in words is "eight hundred seventy-eight million, two hundred sixty-six thousand, three hundred ninety-nine".