2181842 has 16 divisors (see below), whose sum is σ = 3639552. Its totient is φ = 974160.

The previous prime is 2181833. The next prime is 2181857. The reversal of 2181842 is 2481812.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (227472).

2^2181842 is an apocalyptic number.

2181842 is a deficient number, since it is larger than the sum of its proper divisors (1457710).

2181842 is a wasteful number, since it uses less digits than its factorization.

2181842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753.

The product of its digits is 1024, while the sum is 26.

The square root of 2181842 is about 1477.1059542226. The cubic root of 2181842 is about 129.7003354113.

The spelling of 2181842 in words is "two million, one hundred eighty-one thousand, eight hundred forty-two".