2181983 has 4 divisors (see below), whose sum is σ = 2186520. Its totient is φ = 2177448.

The previous prime is 2181973. The next prime is 2182007. The reversal of 2181983 is 3891812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2181983 - 2⁶ = 2181919 is a prime.

It is a super-2 number, since 2×2181983² = 9522099624578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181953) 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, 1448 + ... + 2541.

It is an arithmetic number, because the mean of its divisors is an integer number (546630).

2^2181983 is an apocalyptic number.

2181983 is a deficient number, since it is larger than the sum of its proper divisors (4537).

2181983 is an equidigital number, since it uses as much as digits as its factorization.

2181983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536.

The product of its digits is 3456, while the sum is 32.

The square root of 2181983 is about 1477.1536819167. The cubic root of 2181983 is about 129.7031292820.

The spelling of 2181983 in words is "two million, one hundred eighty-one thousand, nine hundred eighty-three".