249645 has 32 divisors (see below), whose sum is σ = 466560. Its totient is φ = 112640.

The previous prime is 249607. The next prime is 249647. The reversal of 249645 is 546942.

It is not a de Polignac number, because 249645 - 2⁷ = 249517 is a prime.

It is a super-3 number, since 3×249645³ = 46675595922033375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2761 + ... + 2849.

It is an arithmetic number, because the mean of its divisors is an integer number (14580).

2²⁴⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

249645 is a deficient number, since it is larger than the sum of its proper divisors (216915).

249645 is a wasteful number, since it uses less digits than its factorization.

249645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125.

The product of its digits is 8640, while the sum is 30.

The square root of 249645 is about 499.6448738854. The cubic root of 249645 is about 62.9662202382.

It can be divided in two parts, 24 and 9645, that added together give a palindrome (9669).

The spelling of 249645 in words is "two hundred forty-nine thousand, six hundred forty-five".