9999873 has 12 divisors (see below), whose sum is σ = 15555540.
Its totient is φ = 6153696.
The previous prime is 9999863. The next prime is 9999877. The reversal of 9999873 is 3789999.
It is a happy number.
It can be written as a sum of positive squares in 2 ways, for example, as 5702544 + 4297329 = 2388^2 + 2073^2
It is not a de Polignac number, because 9999873 - 218 = 9737729 is a prime.
It is a super-2 number, since 2×99998732 = 199994920032258, which contains 22 as substring.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (9999877) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42618 + ... + 42851.
It is an arithmetic number, because the mean of its divisors is an integer number (1296295).
Almost surely, 29999873 is an apocalyptic number.
It is an amenable number.
9999873 is a deficient number, since it is larger than the sum of its proper divisors (5555667).
9999873 is a wasteful number, since it uses less digits than its factorization.
9999873 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 85488 (or 85485 counting only the distinct ones).
The product of its digits is 1102248, while the sum is 54.
The square root of 9999873 is about 3162.2575796415.
The cubic root of 9999873 is about 215.4425569553.
The spelling of 9999873 in words is "nine million, nine hundred ninety-nine thousand, eight hundred seventy-three".