253445 has 8 divisors (see below), whose sum is σ = 306936. Its totient is φ = 200896.

The previous prime is 253439. The next prime is 253447. The reversal of 253445 is 544352.

It can be written as a sum of positive squares in 4 ways, for example, as 139876 + 113569 = 374^2 + 337^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253445 - 2⁶ = 253381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253447) 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, 719 + ... + 1011.

It is an arithmetic number, because the mean of its divisors is an integer number (38367).

2²⁵³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

253445 is a deficient number, since it is larger than the sum of its proper divisors (53491).

253445 is a wasteful number, since it uses less digits than its factorization.

253445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 2400, while the sum is 23.

The square root of 253445 is about 503.4332130482. The cubic root of 253445 is about 63.2840953098.

Adding to 253445 its reverse (544352), we get a palindrome (797797).

The spelling of 253445 in words is "two hundred fifty-three thousand, four hundred forty-five".