248809 has 4 divisors (see below), whose sum is σ = 271440. Its totient is φ = 226180.

The previous prime is 248797. The next prime is 248813. The reversal of 248809 is 908842.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248809 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (248839) 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, 11299 + ... + 11320.

It is an arithmetic number, because the mean of its divisors is an integer number (67860).

2²⁴⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

248809 is a deficient number, since it is larger than the sum of its proper divisors (22631).

248809 is a wasteful number, since it uses less digits than its factorization.

248809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22630.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 248809 is about 498.8075781301. The cubic root of 248809 is about 62.8958554817.

The spelling of 248809 in words is "two hundred forty-eight thousand, eight hundred nine".