99857867 has 2 divisors, whose sum is σ = 99857868. Its totient is φ = 99857866.

The previous prime is 99857861. The next prime is 99857869. The reversal of 99857867 is 76875899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99857867 - 2¹⁸ = 99595723 is a prime.

Together with 99857869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99857861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49928933 + 49928934.

It is an arithmetic number, because the mean of its divisors is an integer number (49928934).

Almost surely, 2^99857867 is an apocalyptic number.

99857867 is a deficient number, since it is larger than the sum of its proper divisors (1).

99857867 is an equidigital number, since it uses as much as digits as its factorization.

99857867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The square root of 99857867 is about 9992.8908229801. The cubic root of 99857867 is about 463.9388714433.

The spelling of 99857867 in words is "ninety-nine million, eight hundred fifty-seven thousand, eight hundred sixty-seven".