278442 has 24 divisors (see below), whose sum is σ = 624000. Its totient is φ = 89640.

The previous prime is 278437. The next prime is 278459. The reversal of 278442 is 244872.

278442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278442.

It is an unprimeable 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 11 ways as a sum of consecutive naturals, for example, 309 + ... + 807.

It is an arithmetic number, because the mean of its divisors is an integer number (26000).

2²⁷⁸⁴⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312000).

278442 is an abundant number, since it is smaller than the sum of its proper divisors (345558).

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

278442 is a wasteful number, since it uses less digits than its factorization.

278442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 535 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 278442 is about 527.6760369772. The cubic root of 278442 is about 65.2997594632.

The spelling of 278442 in words is "two hundred seventy-eight thousand, four hundred forty-two".