2683721 has 4 divisors (see below), whose sum is σ = 2756292. Its totient is φ = 2611152.

The previous prime is 2683717. The next prime is 2683727. The reversal of 2683721 is 1273862.

It is a happy number.

2683721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1273862 = 2 ⋅636931.

It can be written as a sum of positive squares in 2 ways, for example, as 2310400 + 373321 = 1520^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 2683721 - 2² = 2683717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2683727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36230 + ... + 36303.

It is an arithmetic number, because the mean of its divisors is an integer number (689073).

2^2683721 is an apocalyptic number.

It is an amenable number.

2683721 is a deficient number, since it is larger than the sum of its proper divisors (72571).

2683721 is an equidigital number, since it uses as much as digits as its factorization.

2683721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72570.

The product of its digits is 4032, while the sum is 29.

The square root of 2683721 is about 1638.2066414223. The cubic root of 2683721 is about 138.9672472560.

The spelling of 2683721 in words is "two million, six hundred eighty-three thousand, seven hundred twenty-one".