993878857 has 2 divisors, whose sum is σ = 993878858. Its totient is φ = 993878856.

The previous prime is 993878839. The next prime is 993878863. The reversal of 993878857 is 758878399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993762576 + 116281 = 31524^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 993878857 - 2⁷ = 993878729 is a prime.

It is not a weakly prime, because it can be changed into another prime (993878887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496939428 + 496939429.

It is an arithmetic number, because the mean of its divisors is an integer number (496939429).

Almost surely, 2^993878857 is an apocalyptic number.

It is an amenable number.

993878857 is a deficient number, since it is larger than the sum of its proper divisors (1).

993878857 is an equidigital number, since it uses as much as digits as its factorization.

993878857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 64.

The square root of 993878857 is about 31525.8442710104. The cubic root of 993878857 is about 997.9554416300.

The spelling of 993878857 in words is "nine hundred ninety-three million, eight hundred seventy-eight thousand, eight hundred fifty-seven".