2082721 has 8 divisors (see below), whose sum is σ = 2228904. Its totient is φ = 1939200.

The previous prime is 2082713. The next prime is 2082727. The reversal of 2082721 is 1272802.

It can be written as a sum of positive squares in 4 ways, for example, as 555025 + 1527696 = 745^2 + 1236^2 .

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

It is not a de Polignac number, because 2082721 - 2³ = 2082713 is a prime.

It is an Ulam number.

2082721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2082692 and 2082701.

It is not an unprimeable number, because it can be changed into a prime (2082727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (278613).

2^2082721 is an apocalyptic number.

It is an amenable number.

2082721 is a deficient number, since it is larger than the sum of its proper divisors (146183).

2082721 is a wasteful number, since it uses less digits than its factorization.

2082721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2082721 is about 1443.1635388964. The cubic root of 2082721 is about 127.7057245245.

The spelling of 2082721 in words is "two million, eighty-two thousand, seven hundred twenty-one".