252721 has 8 divisors (see below), whose sum is σ = 293120. Its totient is φ = 213408.

The previous prime is 252713. The next prime is 252727. The reversal of 252721 is 127252.

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

It is a cyclic number.

It is not a de Polignac number, because 252721 - 2³ = 252713 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (36640).

2²⁵²⁷²¹ is an apocalyptic number.

It is an amenable number.

252721 is a deficient number, since it is larger than the sum of its proper divisors (40399).

252721 is an equidigital number, since it uses as much as digits as its factorization.

252721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its digits is 280, while the sum is 19.

The square root of 252721 is about 502.7136361787. The cubic root of 252721 is about 63.2237779726.

Adding to 252721 its reverse (127252), we get a palindrome (379973).

The spelling of 252721 in words is "two hundred fifty-two thousand, seven hundred twenty-one".