99857887 has 2 divisors, whose sum is σ = 99857888.
Its totient is φ = 99857886.
The previous prime is 99857873. The next prime is 99857893. The reversal of 99857887 is 78875899.
It is a strong prime.
It is an emirp because it is prime and its reverse (78875899) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 99857887 - 211 = 99855839 is a prime.
It is a super-2 number, since 2×998578872 = 19943195192209538, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99857827) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49928943 + 49928944.
It is an arithmetic number, because the mean of its divisors is an integer number (49928944).
Almost surely, 299857887 is an apocalyptic number.
99857887 is a deficient number, since it is larger than the sum of its proper divisors (1).
99857887 is an equidigital number, since it uses as much as digits as its factorization.
99857887 is an evil number, because the sum of its binary digits is even.
The product of its digits is 10160640, while the sum is 61.
The square root of 99857887 is about 9992.8918236915.
The cubic root of 99857887 is about 463.9389024165.
It can be divided in two parts, 998 and 57887, that added together give a palindrome (58885).
The spelling of 99857887 in words is "ninety-nine million, eight hundred fifty-seven thousand, eight hundred eighty-seven".