812500 has 42 divisors (see below), whose sum is σ = 1914038. Its totient is φ = 300000.

The previous prime is 812491. The next prime is 812501. The reversal of 812500 is 5218.

It is a happy number.

812500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 7 ways, for example, as 770884 + 41616 = 878^2 + 204^2 .

It is a sliding number, since 812500 = 12500 + 800000 and 1/12500 + 1/800000 = 0.0000812500.

It is an Ulam number.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812501) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 62494 + ... + 62506.

2⁸¹²⁵⁰⁰ 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 812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957019).

812500 is an abundant number, since it is smaller than the sum of its proper divisors (1101538).

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

812500 is an equidigital number, since it uses as much as digits as its factorization.

812500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 20 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 812500 is about 901.3878188660. The cubic root of 812500 is about 93.3127789204.

Adding to 812500 its reverse (5218), we get a palindrome (817718).

It can be divided in two parts, 81 and 2500, that multiplied together give a square (202500 = 450²).

The spelling of 812500 in words is "eight hundred twelve thousand, five hundred".