9812500 has 42 divisors (see below), whose sum is σ = 21601286. Its totient is φ = 3900000.

The previous prime is 9812497. The next prime is 9812503. The reversal of 9812500 is 52189.

It is an interprime number because it is at equal distance from previous prime (9812497) and next prime (9812503).

It can be written as a sum of positive squares in 7 ways, for example, as 9622404 + 190096 = 3102^2 + 436^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9812503) 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 13 ways as a sum of consecutive naturals, for example, 62422 + ... + 62578.

Almost surely, 2^9812500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10800643).

9812500 is an abundant number, since it is smaller than the sum of its proper divisors (11788786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9812500 is an equidigital number, since it uses as much as digits as its factorization.

9812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 9812500 is about 3132.4910215354. The cubic root of 9812500 is about 214.0884427861.

Adding to 9812500 its reverse (52189), we get a palindrome (9864689).

It can be divided in two parts, 981 and 2500, that added together give a square (3481 = 59²).

The spelling of 9812500 in words is "nine million, eight hundred twelve thousand, five hundred".