253709 has 4 divisors (see below), whose sum is σ = 260604. Its totient is φ = 246816.

The previous prime is 253703. The next prime is 253717. The reversal of 253709 is 907352.

253709 is nontrivially palindromic in base 6.

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 96100 + 157609 = 310^2 + 397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253703) 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, 3392 + ... + 3465.

It is an arithmetic number, because the mean of its divisors is an integer number (65151).

2²⁵³⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

253709 is a deficient number, since it is larger than the sum of its proper divisors (6895).

253709 is an equidigital number, since it uses as much as digits as its factorization.

253709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 253709 is about 503.6953444295. The cubic root of 253709 is about 63.3060608954.

The spelling of 253709 in words is "two hundred fifty-three thousand, seven hundred nine".