248721 has 8 divisors (see below), whose sum is σ = 361824. Its totient is φ = 150720.

The previous prime is 248719. The next prime is 248723. The reversal of 248721 is 127842.

It is an interprime number because it is at equal distance from previous prime (248719) and next prime (248723).

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

It is not a de Polignac number, because 248721 - 2¹ = 248719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 248691 and 248700.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 248721.

It is not an unprimeable number, because it can be changed into a prime (248723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3736 + ... + 3801.

It is an arithmetic number, because the mean of its divisors is an integer number (45228).

2²⁴⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

248721 is a deficient number, since it is larger than the sum of its proper divisors (113103).

248721 is a wasteful number, since it uses less digits than its factorization.

248721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7551.

The product of its digits is 896, while the sum is 24.

The square root of 248721 is about 498.7193599611. The cubic root of 248721 is about 62.8884395014. Note that the first 3 decimals are identical.

It can be divided in two parts, 248 and 721, that added together give a palindrome (969).

The spelling of 248721 in words is "two hundred forty-eight thousand, seven hundred twenty-one".