9899873 has 4 divisors (see below), whose sum is σ = 10062228. Its totient is φ = 9737520.

The previous prime is 9899863. The next prime is 9899887. The reversal of 9899873 is 3789989.

9899873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 7491169 = 1552^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 9899873 - 2⁶ = 9899809 is a prime.

It is a super-2 number, since 2×9899873² = 196014970832258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9899833) 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, 81086 + ... + 81207.

It is an arithmetic number, because the mean of its divisors is an integer number (2515557).

Almost surely, 2^9899873 is an apocalyptic number.

It is an amenable number.

9899873 is a deficient number, since it is larger than the sum of its proper divisors (162355).

9899873 is a wasteful number, since it uses less digits than its factorization.

9899873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162354.

The product of its digits is 979776, while the sum is 53.

The square root of 9899873 is about 3146.4063628209. The cubic root of 9899873 is about 214.7219987225.

The spelling of 9899873 in words is "nine million, eight hundred ninety-nine thousand, eight hundred seventy-three".