245709 has 12 divisors (see below), whose sum is σ = 370656. Its totient is φ = 156552.

The previous prime is 245683. The next prime is 245711. The reversal of 245709 is 907542.

It is a de Polignac number, because none of the positive numbers 2^k-245709 is a prime.

245709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245719) 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, 387 + ... + 800.

It is an arithmetic number, because the mean of its divisors is an integer number (30888).

2²⁴⁵⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

245709 is a deficient number, since it is larger than the sum of its proper divisors (124947).

245709 is a wasteful number, since it uses less digits than its factorization.

245709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 245709 is about 495.6904275856. The cubic root of 245709 is about 62.6335490976.

The spelling of 245709 in words is "two hundred forty-five thousand, seven hundred nine".