305442 has 24 divisors (see below), whose sum is σ = 673920. Its totient is φ = 99960.

The previous prime is 305441. The next prime is 305449. The reversal of 305442 is 244503.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (305441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1159 + ... + 1397.

It is an arithmetic number, because the mean of its divisors is an integer number (28080).

2³⁰⁵⁴⁴² is an apocalyptic number.

305442 is an abundant number, since it is smaller than the sum of its proper divisors (368478).

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

305442 is a wasteful number, since it uses less digits than its factorization.

305442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 305442 is about 552.6680739829. The cubic root of 305442 is about 67.3456555780.

Adding to 305442 its reverse (244503), we get a palindrome (549945).

It can be divided in two parts, 305 and 442, that added together give a palindrome (747).

The spelling of 305442 in words is "three hundred five thousand, four hundred forty-two".