2347721 has 2 divisors, whose sum is σ = 2347722. Its totient is φ = 2347720.

The previous prime is 2347711. The next prime is 2347727. The reversal of 2347721 is 1277432.

2347721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 657721 = 1300^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2347721 - 2¹⁴ = 2331337 is a prime.

It is not a weakly prime, because it can be changed into another prime (2347727) 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 as a sum of consecutive naturals, namely, 1173860 + 1173861.

It is an arithmetic number, because the mean of its divisors is an integer number (1173861).

2^2347721 is an apocalyptic number.

It is an amenable number.

2347721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2347721 is an equidigital number, since it uses as much as digits as its factorization.

2347721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2347721 is about 1532.2274635314. The cubic root of 2347721 is about 132.9072977917.

The spelling of 2347721 in words is "two million, three hundred forty-seven thousand, seven hundred twenty-one".