2600721 has 8 divisors (see below), whose sum is σ = 3852960. Its totient is φ = 1733796.

The previous prime is 2600707. The next prime is 2600761. The reversal of 2600721 is 1270062.

It is a happy number.

It is not a de Polignac number, because 2600721 - 2⁷ = 2600593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2600694 and 2600703.

It is not an unprimeable number, because it can be changed into a prime (2600761) 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, 48135 + ... + 48188.

It is an arithmetic number, because the mean of its divisors is an integer number (481620).

2^2600721 is an apocalyptic number.

It is an amenable number.

2600721 is a deficient number, since it is larger than the sum of its proper divisors (1252239).

2600721 is an equidigital number, since it uses as much as digits as its factorization.

2600721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96332 (or 96326 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 2600721 is about 1612.6751067714. The cubic root of 2600721 is about 137.5195961052.

Adding to 2600721 its reverse (1270062), we get a palindrome (3870783).

It can be divided in two parts, 2600 and 721, that added together give a triangular number (3321 = T₈₁).

The spelling of 2600721 in words is "two million, six hundred thousand, seven hundred twenty-one".