2721257 has 16 divisors (see below), whose sum is σ = 3456000. Its totient is φ = 2081040.

The previous prime is 2721247. The next prime is 2721259. The reversal of 2721257 is 7521272.

2721257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2721257 - 2⁶ = 2721193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721259) 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 15 ways as a sum of consecutive naturals, for example, 4244 + ... + 4842.

It is an arithmetic number, because the mean of its divisors is an integer number (216000).

2^2721257 is an apocalyptic number.

It is an amenable number.

2721257 is a deficient number, since it is larger than the sum of its proper divisors (734743).

2721257 is a wasteful number, since it uses less digits than its factorization.

2721257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its digits is 1960, while the sum is 26.

The square root of 2721257 is about 1649.6232903302. The cubic root of 2721257 is about 139.6121407437.

The spelling of 2721257 in words is "two million, seven hundred twenty-one thousand, two hundred fifty-seven".