2203812 has 72 divisors (see below), whose sum is σ = 6375096. Its totient is φ = 635904.

The previous prime is 2203811. The next prime is 2203843. The reversal of 2203812 is 2183022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 60516 + 2143296 = 246^2 + 1464^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2203811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7818 + ... + 8094.

It is an arithmetic number, because the mean of its divisors is an integer number (88543).

2^2203812 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 2203812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3187548).

2203812 is an abundant number, since it is smaller than the sum of its proper divisors (4171284).

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

2203812 is a wasteful number, since it uses less digits than its factorization.

2203812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2203812 is about 1484.5241661893. The cubic root of 2203812 is about 130.1342203490.

Adding to 2203812 its reverse (2183022), we get a palindrome (4386834).

The spelling of 2203812 in words is "two million, two hundred three thousand, eight hundred twelve".