2008721 has 12 divisors (see below), whose sum is σ = 2379636. Its totient is φ = 1684320.

The previous prime is 2008717. The next prime is 2008729. The reversal of 2008721 is 1278002.

It can be written as a sum of positive squares in 2 ways, for example, as 774400 + 1234321 = 880^2 + 1111^2 .

It is not a de Polignac number, because 2008721 - 2² = 2008717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2008693 and 2008702.

It is not an unprimeable number, because it can be changed into a prime (2008729) 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 11 ways as a sum of consecutive naturals, for example, 935 + ... + 2211.

It is an arithmetic number, because the mean of its divisors is an integer number (198303).

2^2008721 is an apocalyptic number.

It is an amenable number.

2008721 is a deficient number, since it is larger than the sum of its proper divisors (370915).

2008721 is a wasteful number, since it uses less digits than its factorization.

2008721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1301 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 2008721 is about 1417.2935475758. The cubic root of 2008721 is about 126.1749689783.

The spelling of 2008721 in words is "two million, eight thousand, seven hundred twenty-one".