249540 has 24 divisors (see below), whose sum is σ = 698880. Its totient is φ = 66528.

The previous prime is 249539. The next prime is 249541. The reversal of 249540 is 45942.

It is an interprime number because it is at equal distance from previous prime (249539) and next prime (249541).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 249540.

It is not an unprimeable number, because it can be changed into a prime (249541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2020 + ... + 2139.

It is an arithmetic number, because the mean of its divisors is an integer number (29120).

2²⁴⁹⁵⁴⁰ is an apocalyptic number.

249540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249540 is an abundant number, since it is smaller than the sum of its proper divisors (449340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249540 is a wasteful number, since it uses less digits than its factorization.

249540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171 (or 4169 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 249540 is about 499.5397882051. The cubic root of 249540 is about 62.9573911939.

The spelling of 249540 in words is "two hundred forty-nine thousand, five hundred forty".