3181812 has 12 divisors (see below), whose sum is σ = 7424256. Its totient is φ = 1060600.

The previous prime is 3181781. The next prime is 3181813. The reversal of 3181812 is 2181813.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3181813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132564 + ... + 132587.

It is an arithmetic number, because the mean of its divisors is an integer number (618688).

Almost surely, 2^3181812 is an apocalyptic number.

It is an amenable number.

3181812 is an abundant number, since it is smaller than the sum of its proper divisors (4242444).

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

3181812 is a wasteful number, since it uses less digits than its factorization.

3181812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265158 (or 265156 counting only the distinct ones).

The product of its digits is 384, while the sum is 24.

The square root of 3181812 is about 1783.7634372304. The cubic root of 3181812 is about 147.0815411367.

Subtracting from 3181812 its reverse (2181813), we obtain a palindrome (999999).

It can be divided in two parts, 3181 and 812, that added together give a palindrome (3993).

The spelling of 3181812 in words is "three million, one hundred eighty-one thousand, eight hundred twelve".