260721 has 12 divisors (see below), whose sum is σ = 383760. Its totient is φ = 170520.

The previous prime is 260717. The next prime is 260723. The reversal of 260721 is 127062.

It is a happy number.

260721 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 260721 - 2² = 260717 is a prime.

260721 is strictly pandigital in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 260694 and 260703.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 260721.

It is not an unprimeable number, because it can be changed into a prime (260723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (31980).

2²⁶⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

260721 is a deficient number, since it is larger than the sum of its proper divisors (123039).

260721 is a wasteful number, since it uses less digits than its factorization.

260721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 553 counting only the distinct ones).

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

The square root of 260721 is about 510.6084605645. The cubic root of 260721 is about 63.8839857891.

Adding to 260721 its reverse (127062), we get a palindrome (387783).

It can be divided in two parts, 2607 and 21, that added together give a triangular number (2628 = T₇₂).

The spelling of 260721 in words is "two hundred sixty thousand, seven hundred twenty-one".