99897857 has 4 divisors (see below), whose sum is σ = 99966000. Its totient is φ = 99829716.

The previous prime is 99897773. The next prime is 99897881. The reversal of 99897857 is 75879899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75879899 = 97 ⋅782267.

It is a cyclic number.

It is not a de Polignac number, because 99897857 - 2⁸ = 99897601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99897857.

It is not an unprimeable number, because it can be changed into a prime (99897757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31823 + ... + 34820.

It is an arithmetic number, because the mean of its divisors is an integer number (24991500).

Almost surely, 2^99897857 is an apocalyptic number.

It is an amenable number.

99897857 is a deficient number, since it is larger than the sum of its proper divisors (68143).

99897857 is a wasteful number, since it uses less digits than its factorization.

99897857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68142.

The product of its digits is 11430720, while the sum is 62.

The square root of 99897857 is about 9994.8915451845. The cubic root of 99897857 is about 464.0007942540. Note that the first 3 decimals are identical.

The spelling of 99897857 in words is "ninety-nine million, eight hundred ninety-seven thousand, eight hundred fifty-seven".