278939 has 8 divisors (see below), whose sum is σ = 300240. Its totient is φ = 258336.

The previous prime is 278917. The next prime is 278947. The reversal of 278939 is 939872.

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

It is a cyclic number.

It is not a de Polignac number, because 278939 - 2¹² = 274843 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (278909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869 + ... + 1145.

It is an arithmetic number, because the mean of its divisors is an integer number (37530).

2²⁷⁸⁹³⁹ is an apocalyptic number.

278939 is a deficient number, since it is larger than the sum of its proper divisors (21301).

278939 is a wasteful number, since it uses less digits than its factorization.

278939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349.

The product of its digits is 27216, while the sum is 38.

The square root of 278939 is about 528.1467599068. The cubic root of 278939 is about 65.3385882441.

The spelling of 278939 in words is "two hundred seventy-eight thousand, nine hundred thirty-nine".