1820312 has 32 divisors (see below), whose sum is σ = 3840480. Its totient is φ = 802560.

The previous prime is 1820311. The next prime is 1820339. The reversal of 1820312 is 2130281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820311) 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 7 ways as a sum of consecutive naturals, for example, 2012 + ... + 2772.

It is an arithmetic number, because the mean of its divisors is an integer number (120015).

2^1820312 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 1820312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920240).

1820312 is an abundant number, since it is smaller than the sum of its proper divisors (2020168).

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

1820312 is a wasteful number, since it uses less digits than its factorization.

1820312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1820312 is about 1349.1893862612. The cubic root of 1820312 is about 122.0998913140.

Adding to 1820312 its reverse (2130281), we get a palindrome (3950593).

The spelling of 1820312 in words is "one million, eight hundred twenty thousand, three hundred twelve".