2131812 has 24 divisors (see below), whose sum is σ = 5527200. Its totient is φ = 710568.

The previous prime is 2131799. The next prime is 2131813. The reversal of 2131812 is 2181312.

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 (2131813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9762 + ... + 9977.

It is an arithmetic number, because the mean of its divisors is an integer number (230300).

2^2131812 is an apocalyptic number.

It is an amenable number.

2131812 is an abundant number, since it is smaller than the sum of its proper divisors (3395388).

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

2131812 is a wasteful number, since it uses less digits than its factorization.

2131812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19752 (or 19744 counting only the distinct ones).

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

The square root of 2131812 is about 1460.0726009346. The cubic root of 2131812 is about 128.7013100208.

It can be divided in two parts, 213 and 1812, that added together give a square (2025 = 45²).

The spelling of 2131812 in words is "two million, one hundred thirty-one thousand, eight hundred twelve".