249685 has 4 divisors (see below), whose sum is σ = 299628. Its totient is φ = 199744.

The previous prime is 249677. The next prime is 249703. The reversal of 249685 is 586942.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 178929 = 266^2 + 423^2 .

It is a cyclic number.

It is not a de Polignac number, because 249685 - 2³ = 249677 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24964 + ... + 24973.

It is an arithmetic number, because the mean of its divisors is an integer number (74907).

2²⁴⁹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

249685 is a deficient number, since it is larger than the sum of its proper divisors (49943).

249685 is an equidigital number, since it uses as much as digits as its factorization.

249685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49942.

The product of its digits is 17280, while the sum is 34.

The square root of 249685 is about 499.6849007124. The cubic root of 249685 is about 62.9695830324.

The spelling of 249685 in words is "two hundred forty-nine thousand, six hundred eighty-five".