721712 has 20 divisors (see below), whose sum is σ = 1432200. Its totient is φ = 352128.

The previous prime is 721709. The next prime is 721733. The reversal of 721712 is 217127.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 164 + ... + 1212.

It is an arithmetic number, because the mean of its divisors is an integer number (71610).

2⁷²¹⁷¹² is an apocalyptic number.

It is an amenable number.

721712 is a deficient number, since it is larger than the sum of its proper divisors (710488).

721712 is a wasteful number, since it uses less digits than its factorization.

721712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100 (or 1094 counting only the distinct ones).

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

The square root of 721712 is about 849.5363441313. The cubic root of 721712 is about 89.6990772649.

Adding to 721712 its reverse (217127), we get a palindrome (938839).

The spelling of 721712 in words is "seven hundred twenty-one thousand, seven hundred twelve", and thus it is an iban number.