2183721 has 8 divisors (see below), whose sum is σ = 2940864. Its totient is φ = 1441200.

The previous prime is 2183719. The next prime is 2183723. The reversal of 2183721 is 1273812.

It is an interprime number because it is at equal distance from previous prime (2183719) and next prime (2183723).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2183721 - 2¹ = 2183719 is a prime.

2183721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2183691 and 2183700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2183723) 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, 3301 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (367608).

2^2183721 is an apocalyptic number.

It is an amenable number.

2183721 is a deficient number, since it is larger than the sum of its proper divisors (757143).

2183721 is a wasteful number, since it uses less digits than its factorization.

2183721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7311.

The product of its digits is 672, while the sum is 24.

The square root of 2183721 is about 1477.7418583772. The cubic root of 2183721 is about 129.7375573249.

Subtracting from 2183721 its reverse (1273812), we obtain a palindrome (909909).

The spelling of 2183721 in words is "two million, one hundred eighty-three thousand, seven hundred twenty-one".