253945 has 4 divisors (see below), whose sum is σ = 304740. Its totient is φ = 203152.

The previous prime is 253937. The next prime is 253949. The reversal of 253945 is 549352.

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 43264 + 210681 = 208^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 253945 - 2³ = 253937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253949) 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, 25390 + ... + 25399.

It is an arithmetic number, because the mean of its divisors is an integer number (76185).

2²⁵³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

253945 is a deficient number, since it is larger than the sum of its proper divisors (50795).

253945 is an equidigital number, since it uses as much as digits as its factorization.

253945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50794.

The product of its digits is 5400, while the sum is 28.

The square root of 253945 is about 503.9295585694. The cubic root of 253945 is about 63.3256839022.

The spelling of 253945 in words is "two hundred fifty-three thousand, nine hundred forty-five".