539721 has 24 divisors (see below), whose sum is σ = 960960. Its totient is φ = 284256.

The previous prime is 539713. The next prime is 539723. The reversal of 539721 is 127935.

It is not a de Polignac number, because 539721 - 2³ = 539713 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 539721.

It is not an unprimeable number, because it can be changed into a prime (539723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 490 + ... + 1148.

It is an arithmetic number, because the mean of its divisors is an integer number (40040).

2⁵³⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

539721 is a deficient number, since it is larger than the sum of its proper divisors (421239).

539721 is a wasteful number, since it uses less digits than its factorization.

539721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 682 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 539721 is about 734.6570628531. The cubic root of 539721 is about 81.4185015908.

The spelling of 539721 in words is "five hundred thirty-nine thousand, seven hundred twenty-one".