5817721 has 12 divisors (see below), whose sum is σ = 7288932. Its totient is φ = 4602528.

The previous prime is 5817703. The next prime is 5817733. The reversal of 5817721 is 1277185.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2706025 + 3111696 = 1645^2 + 1764^2 .

It is not a de Polignac number, because 5817721 - 2⁷ = 5817593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5817751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3930 + ... + 5203.

It is an arithmetic number, because the mean of its divisors is an integer number (607411).

Almost surely, 2^5817721 is an apocalyptic number.

It is an amenable number.

5817721 is a deficient number, since it is larger than the sum of its proper divisors (1471211).

5817721 is a wasteful number, since it uses less digits than its factorization.

5817721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9160 (or 9153 counting only the distinct ones).

The product of its digits is 3920, while the sum is 31.

The square root of 5817721 is about 2411.9952321678. The cubic root of 5817721 is about 179.8529766524.

The spelling of 5817721 in words is "five million, eight hundred seventeen thousand, seven hundred twenty-one".