2371721 has 12 divisors (see below), whose sum is σ = 2762676. Its totient is φ = 2027520.

The previous prime is 2371711. The next prime is 2371729. The reversal of 2371721 is 1271732.

It can be written as a sum of positive squares in 2 ways, for example, as 1860496 + 511225 = 1364^2 + 715^2 .

It is not a de Polignac number, because 2371721 - 2¹⁴ = 2355337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2371729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1481 + ... + 2633.

It is an arithmetic number, because the mean of its divisors is an integer number (230223).

2^2371721 is an apocalyptic number.

It is an amenable number.

2371721 is a deficient number, since it is larger than the sum of its proper divisors (390955).

2371721 is a wasteful number, since it uses less digits than its factorization.

2371721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192 (or 1181 counting only the distinct ones).

The product of its digits is 588, while the sum is 23.

The square root of 2371721 is about 1540.0392852132. The cubic root of 2371721 is about 133.3586528305.

The spelling of 2371721 in words is "two million, three hundred seventy-one thousand, seven hundred twenty-one".