249775 has 12 divisors (see below), whose sum is σ = 315952. Its totient is φ = 195840.

The previous prime is 249763. The next prime is 249779. The reversal of 249775 is 577942.

It is not a de Polignac number, because 249775 - 2⁷ = 249647 is a prime.

It is a Duffinian number.

Its product of digits (17640) is a multiple of the sum of its prime factors (210).

It is a self number, because there is not a number n which added to its sum of digits gives 249775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2374 + ... + 2476.

2²⁴⁹⁷⁷⁵ is an apocalyptic number.

249775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

249775 is a deficient number, since it is larger than the sum of its proper divisors (66177).

249775 is a wasteful number, since it uses less digits than its factorization.

249775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 205 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 249775 is about 499.7749493522. The cubic root of 249775 is about 62.9771480065.

It can be divided in two parts, 249 and 775, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 249775 in words is "two hundred forty-nine thousand, seven hundred seventy-five".