9899 has 4 divisors (see below), whose sum is σ = 10440. Its totient is φ = 9360.

The previous prime is 9887. The next prime is 9901. The reversal of 9899 is 9989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9989 = 7 ⋅1427.

It is a cyclic number.

It is not a de Polignac number, because 9899 - 2⁴ = 9883 is a prime.

It is a Duffinian number.

9899 is a modest number, since divided by 99 gives 98 as remainder.

It is a plaindrome in base 6, base 12, base 15 and base 16.

It is not an unprimeable number, because it can be changed into a prime (9829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242 + ... + 279.

It is an arithmetic number, because the mean of its divisors is an integer number (2610).

2⁹⁸⁹⁹ is an apocalyptic number.

9899 is a deficient number, since it is larger than the sum of its proper divisors (541).

9899 is a wasteful number, since it uses less digits than its factorization.

9899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its digits is 5832, while the sum is 35.

The square root of 9899 is about 99.4937183947. The cubic root of 9899 is about 21.4715686931.

The spelling of 9899 in words is "nine thousand, eight hundred ninety-nine".