5705721 has 40 divisors (see below), whose sum is σ = 10105920. Its totient is φ = 3138912.

The previous prime is 5705699. The next prime is 5705731. The reversal of 5705721 is 1275075.

It is not a de Polignac number, because 5705721 - 2¹³ = 5697529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

5705721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5705731) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16270 + ... + 16616.

It is an arithmetic number, because the mean of its divisors is an integer number (252648).

Almost surely, 2^5705721 is an apocalyptic number.

It is an amenable number.

5705721 is a deficient number, since it is larger than the sum of its proper divisors (4400199).

5705721 is a wasteful number, since it uses less digits than its factorization.

5705721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 5705721 is about 2388.6651083817. The cubic root of 5705721 is about 178.6913420259.

The spelling of 5705721 in words is "five million, seven hundred five thousand, seven hundred twenty-one".