2000721 has 8 divisors (see below), whose sum is σ = 2679264. Its totient is φ = 1328000.

The previous prime is 2000717. The next prime is 2000731. The reversal of 2000721 is 1270002.

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

It is a cyclic number.

It is not a de Polignac number, because 2000721 - 2² = 2000717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2000697 and 2000706.

It is not an unprimeable number, because it can be changed into a prime (2000731) 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 7 ways as a sum of consecutive naturals, for example, 576 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (334908).

2^2000721 is an apocalyptic number.

It is an amenable number.

2000721 is a deficient number, since it is larger than the sum of its proper divisors (678543).

2000721 is a wasteful number, since it uses less digits than its factorization.

2000721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 2000721 is about 1414.4684513979. The cubic root of 2000721 is about 126.0072432218.

Adding to 2000721 its reverse (1270002), we get a palindrome (3270723).

The spelling of 2000721 in words is "two million, seven hundred twenty-one", and thus it is an aban number.