262721 has 4 divisors (see below), whose sum is σ = 267732. Its totient is φ = 257712.

The previous prime is 262709. The next prime is 262723. The reversal of 262721 is 127262.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207025 + 55696 = 455^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 262721 - 2⁶ = 262657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 262693 and 262702.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 262721.

It is not an unprimeable number, because it can be changed into a prime (262723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2426 + ... + 2531.

It is an arithmetic number, because the mean of its divisors is an integer number (66933).

2²⁶²⁷²¹ is an apocalyptic number.

It is an amenable number.

262721 is a deficient number, since it is larger than the sum of its proper divisors (5011).

262721 is an equidigital number, since it uses as much as digits as its factorization.

262721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

The product of its digits is 336, while the sum is 20.

The square root of 262721 is about 512.5631668390. The cubic root of 262721 is about 64.0469219707.

Adding to 262721 its reverse (127262), we get a palindrome (389983).

The spelling of 262721 in words is "two hundred sixty-two thousand, seven hundred twenty-one".