1813212 has 48 divisors (see below), whose sum is σ = 4775680. Its totient is φ = 594864.

The previous prime is 1813211. The next prime is 1813219. The reversal of 1813212 is 2123181.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11043 + ... + 11205.

2^1813212 is an apocalyptic number.

1813212 is a gapful number since it is divisible by the number (12) 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 1813212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2387840).

1813212 is an abundant number, since it is smaller than the sum of its proper divisors (2962468).

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

1813212 is a wasteful number, since it uses less digits than its factorization.

1813212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 271 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1813212 is about 1346.5556059814. Note that the first 3 decimals coincide. The cubic root of 1813212 is about 121.9409371012.

Adding to 1813212 its reverse (2123181), we get a palindrome (3936393).

It can be divided in two parts, 1813 and 212, that added together give a square (2025 = 45²).

The spelling of 1813212 in words is "one million, eight hundred thirteen thousand, two hundred twelve".