2745721 has 8 divisors (see below), whose sum is σ = 3171744. Its totient is φ = 2349120.

The previous prime is 2745719. The next prime is 2745731. The reversal of 2745721 is 1275472.

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 2745721 - 2¹ = 2745719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2745721.

It is not an unprimeable number, because it can be changed into a prime (2745731) 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, 7155 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (396468).

2^2745721 is an apocalyptic number.

It is an amenable number.

2745721 is a deficient number, since it is larger than the sum of its proper divisors (426023).

2745721 is a wasteful number, since it uses less digits than its factorization.

2745721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14711.

The product of its digits is 3920, while the sum is 28.

The square root of 2745721 is about 1657.0217258684. The cubic root of 2745721 is about 140.0292625906.

It can be divided in two parts, 274 and 5721, that added together give a palindrome (5995).

The spelling of 2745721 in words is "two million, seven hundred forty-five thousand, seven hundred twenty-one".