2113812 has 36 divisors (see below), whose sum is σ = 5425056. Its totient is φ = 693840.

The previous prime is 2113801. The next prime is 2113819. The reversal of 2113812 is 2183112.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2143 + ... + 2969.

It is an arithmetic number, because the mean of its divisors is an integer number (150696).

2^2113812 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 2113812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2712528).

2113812 is an abundant number, since it is smaller than the sum of its proper divisors (3311244).

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

2113812 is a wasteful number, since it uses less digits than its factorization.

2113812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908 (or 903 counting only the distinct ones).

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

The square root of 2113812 is about 1453.8954570395. The cubic root of 2113812 is about 128.3380549602.

Adding to 2113812 its reverse (2183112), we get a palindrome (4296924).

The spelling of 2113812 in words is "two million, one hundred thirteen thousand, eight hundred twelve".