245442 has 16 divisors (see below), whose sum is σ = 516960. Its totient is φ = 77472.

The previous prime is 245437. The next prime is 245471. The reversal of 245442 is 244542.

It is an unprimeable number.

245442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 963 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (32310).

2²⁴⁵⁴⁴² is an apocalyptic number.

245442 is an abundant number, since it is smaller than the sum of its proper divisors (271518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

245442 is a wasteful number, since it uses less digits than its factorization.

245442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177.

The product of its digits is 1280, while the sum is 21.

The square root of 245442 is about 495.4210330618. The cubic root of 245442 is about 62.6108539329.

Adding to 245442 its reverse (244542), we get a palindrome (489984).

Subtracting from 245442 its reverse (244542), we obtain a square (900 = 30²).

The spelling of 245442 in words is "two hundred forty-five thousand, four hundred forty-two".