240539 has 4 divisors (see below), whose sum is σ = 259056. Its totient is φ = 222024.

The previous prime is 240517. The next prime is 240551. The reversal of 240539 is 935042.

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

It is a cyclic number.

It is not a de Polignac number, because 240539 - 2⁸ = 240283 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9239 + ... + 9264.

It is an arithmetic number, because the mean of its divisors is an integer number (64764).

2²⁴⁰⁵³⁹ is an apocalyptic number.

240539 is a deficient number, since it is larger than the sum of its proper divisors (18517).

240539 is a wasteful number, since it uses less digits than its factorization.

240539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18516.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 240539 is about 490.4477546080. The cubic root of 240539 is about 62.1911375110.

The spelling of 240539 in words is "two hundred forty thousand, five hundred thirty-nine".