2718721 has 8 divisors (see below), whose sum is σ = 2831400. Its totient is φ = 2607360.

The previous prime is 2718719. The next prime is 2718743. The reversal of 2718721 is 1278172.

It can be written as a sum of positive squares in 4 ways, for example, as 408321 + 2310400 = 639^2 + 1520^2 .

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 2718721 - 2¹ = 2718719 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 2718721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2713721) 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, 6795 + ... + 7183.

It is an arithmetic number, because the mean of its divisors is an integer number (353925).

2^2718721 is an apocalyptic number.

It is an amenable number.

2718721 is a deficient number, since it is larger than the sum of its proper divisors (112679).

2718721 is a wasteful number, since it uses less digits than its factorization.

2718721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 1568, while the sum is 28.

The square root of 2718721 is about 1648.8544508234. The cubic root of 2718721 is about 139.5687580435.

The spelling of 2718721 in words is "two million, seven hundred eighteen thousand, seven hundred twenty-one".