1812500 has 42 divisors (see below), whose sum is σ = 4101510. Its totient is φ = 700000.

The previous prime is 1812457. The next prime is 1812509. The reversal of 1812500 is 52181.

It can be written as a sum of positive squares in 7 ways, for example, as 1811716 + 784 = 1346^2 + 28^2 .

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812509) 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, 62486 + ... + 62514.

It is an arithmetic number, because the mean of its divisors is an integer number (97655).

2^1812500 is an apocalyptic number.

1812500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2050755).

1812500 is an abundant number, since it is smaller than the sum of its proper divisors (2289010).

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

1812500 is an frugal number, since it uses more digits than its factorization.

1812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1812500 is about 1346.2912017836. The cubic root of 1812500 is about 121.9249740268.

Adding to 1812500 its reverse (52181), we get a palindrome (1864681).

The spelling of 1812500 in words is "one million, eight hundred twelve thousand, five hundred".