278842 has 8 divisors (see below), whose sum is σ = 422496. Its totient is φ = 138012.

The previous prime is 278827. The next prime is 278843. The reversal of 278842 is 248872.

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

It is not an unprimeable number, because it can be changed into a prime (278843) by changing a digit.

278842 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438 + ... + 865.

It is an arithmetic number, because the mean of its divisors is an integer number (52812).

2²⁷⁸⁸⁴² is an apocalyptic number.

278842 is a deficient number, since it is larger than the sum of its proper divisors (143654).

278842 is a wasteful number, since it uses less digits than its factorization.

278842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412.

The product of its digits is 7168, while the sum is 31.

The square root of 278842 is about 528.0549213860. The cubic root of 278842 is about 65.3310136156.

The spelling of 278842 in words is "two hundred seventy-eight thousand, eight hundred forty-two".