249885 has 20 divisors (see below), whose sum is σ = 448668. Its totient is φ = 133056.

The previous prime is 249881. The next prime is 249911. The reversal of 249885 is 588942.

249885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39204 + 210681 = 198^2 + 459^2 .

It is not a de Polignac number, because 249885 - 2² = 249881 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249885.

It is not an unprimeable number, because it can be changed into a prime (249881) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 97 + ... + 713.

2²⁴⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

249885 is a deficient number, since it is larger than the sum of its proper divisors (198783).

249885 is an equidigital number, since it uses as much as digits as its factorization.

249885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 625 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 249885 is about 499.8849867720. The cubic root of 249885 is about 62.9863916185.

The spelling of 249885 in words is "two hundred forty-nine thousand, eight hundred eighty-five".