275721 has 8 divisors (see below), whose sum is σ = 372960. Its totient is φ = 181152.

The previous prime is 275719. The next prime is 275729. The reversal of 275721 is 127572.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 275721 - 2¹ = 275719 is a prime.

It is a Curzon number.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 275691 and 275700.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 275721.

It is not an unprimeable number, because it can be changed into a prime (275729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 411 + ... + 848.

It is an arithmetic number, because the mean of its divisors is an integer number (46620).

2²⁷⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

275721 is a deficient number, since it is larger than the sum of its proper divisors (97239).

275721 is a wasteful number, since it uses less digits than its factorization.

275721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335.

The product of its digits is 980, while the sum is 24.

The square root of 275721 is about 525.0914206117. The cubic root of 275721 is about 65.0863546522.

The spelling of 275721 in words is "two hundred seventy-five thousand, seven hundred twenty-one".