9999825 has 96 divisors (see below), whose sum is σ = 20570112. Its totient is φ = 4224000.

The previous prime is 9999823. The next prime is 9999863. The reversal of 9999825 is 5289999.

It is not a de Polignac number, because 9999825 - 2¹ = 9999823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

Its product of digits (524880) is a multiple of the sum of its prime divisors (90).

9999825 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9999823) 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 95 ways as a sum of consecutive naturals, for example, 322560 + ... + 322590.

It is an arithmetic number, because the mean of its divisors is an integer number (214272).

Almost surely, 2^9999825 is an apocalyptic number.

It is an amenable number.

9999825 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

9999825 is a wasteful number, since it uses less digits than its factorization.

9999825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 90 counting only the distinct ones).

The product of its digits is 524880, while the sum is 51.

The square root of 9999825 is about 3162.2499901178. The cubic root of 9999825 is about 215.4422122423.

The spelling of 9999825 in words is "nine million, nine hundred ninety-nine thousand, eight hundred twenty-five".