2181612 has 24 divisors (see below), whose sum is σ = 5266800. Its totient is φ = 702016.

The previous prime is 2181611. The next prime is 2181629. The reversal of 2181612 is 2161812.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2181611) 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, 2787 + ... + 3482.

It is an arithmetic number, because the mean of its divisors is an integer number (219450).

2^2181612 is an apocalyptic number.

It is an amenable number.

2181612 is an abundant number, since it is smaller than the sum of its proper divisors (3085188).

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

2181612 is a wasteful number, since it uses less digits than its factorization.

2181612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6303 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

The square root of 2181612 is about 1477.0280972277. The cubic root of 2181612 is about 129.6957777752.

It can be divided in two parts, 218 and 1612, that added together give a triangular number (1830 = T₆₀).

The spelling of 2181612 in words is "two million, one hundred eighty-one thousand, six hundred twelve".