712721 has 8 divisors (see below), whose sum is σ = 747264. Its totient is φ = 678960.

The previous prime is 712717. The next prime is 712739. The reversal of 712721 is 127217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 712721 - 2² = 712717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 712693 and 712702.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 712721.

It is not an unprimeable number, because it can be changed into a prime (712711) 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 7 ways as a sum of consecutive naturals, for example, 2435 + ... + 2711.

It is an arithmetic number, because the mean of its divisors is an integer number (93408).

2⁷¹²⁷²¹ is an apocalyptic number.

It is an amenable number.

712721 is a deficient number, since it is larger than the sum of its proper divisors (34543).

712721 is a wasteful number, since it uses less digits than its factorization.

712721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 196, while the sum is 20.

The square root of 712721 is about 844.2280497591. The cubic root of 712721 is about 89.3250329532.

Adding to 712721 its reverse (127217), we get a palindrome (839938).

The spelling of 712721 in words is "seven hundred twelve thousand, seven hundred twenty-one", and thus it is an iban number.