2743721 has 4 divisors (see below), whose sum is σ = 2763600. Its totient is φ = 2723844.

The previous prime is 2743711. The next prime is 2743723. The reversal of 2743721 is 1273472.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-2743721 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2743723) 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 3 ways as a sum of consecutive naturals, for example, 9731 + ... + 10008.

It is an arithmetic number, because the mean of its divisors is an integer number (690900).

2^2743721 is an apocalyptic number.

It is an amenable number.

2743721 is a deficient number, since it is larger than the sum of its proper divisors (19879).

2743721 is a wasteful number, since it uses less digits than its factorization.

2743721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19878.

The product of its digits is 2352, while the sum is 26.

The square root of 2743721 is about 1656.4181235425. The cubic root of 2743721 is about 139.9952549412.

The spelling of 2743721 in words is "two million, seven hundred forty-three thousand, seven hundred twenty-one".