721143 has 20 divisors (see below), whose sum is σ = 1118040. Its totient is φ = 462672.

The previous prime is 721141. The next prime is 721159. The reversal of 721143 is 341127.

721143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721143 - 2¹ = 721141 is a prime.

It is a super-3 number, since 3×721143³ = 1125085251069333621, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2196 + ... + 2502.

It is an arithmetic number, because the mean of its divisors is an integer number (55902).

2⁷²¹¹⁴³ is an apocalyptic number.

721143 is a deficient number, since it is larger than the sum of its proper divisors (396897).

721143 is a wasteful number, since it uses less digits than its factorization.

721143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 339 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 721143 is about 849.2013895420. The cubic root of 721143 is about 89.6754980561.

The spelling of 721143 in words is "seven hundred twenty-one thousand, one hundred forty-three", and thus it is an iban number.