5712721 has 4 divisors (see below), whose sum is σ = 6528832. Its totient is φ = 4896612.

The previous prime is 5712719. The next prime is 5712737. The reversal of 5712721 is 1272175.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5712721 - 2¹ = 5712719 is a prime.

It is a Duffinian number.

5712721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5712121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408045 + ... + 408058.

It is an arithmetic number, because the mean of its divisors is an integer number (1632208).

Almost surely, 2^5712721 is an apocalyptic number.

It is an amenable number.

5712721 is a deficient number, since it is larger than the sum of its proper divisors (816111).

5712721 is an equidigital number, since it uses as much as digits as its factorization.

5712721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816110.

The product of its digits is 980, while the sum is 25.

The square root of 5712721 is about 2390.1299127872. The cubic root of 5712721 is about 178.7643873206.

Adding to 5712721 its reverse (1272175), we get a palindrome (6984896).

The spelling of 5712721 in words is "five million, seven hundred twelve thousand, seven hundred twenty-one".