278339 has 4 divisors (see below), whose sum is σ = 284856. Its totient is φ = 271824.

The previous prime is 278329. The next prime is 278347. The reversal of 278339 is 933872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278339 - 2¹² = 274243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278329) 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, 3194 + ... + 3279.

It is an arithmetic number, because the mean of its divisors is an integer number (71214).

2²⁷⁸³³⁹ is an apocalyptic number.

278339 is a deficient number, since it is larger than the sum of its proper divisors (6517).

278339 is an equidigital number, since it uses as much as digits as its factorization.

278339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516.

The product of its digits is 9072, while the sum is 32.

The square root of 278339 is about 527.5784301883. The cubic root of 278339 is about 65.2917066734.

The spelling of 278339 in words is "two hundred seventy-eight thousand, three hundred thirty-nine".