278239 has 8 divisors (see below), whose sum is σ = 317520. Its totient is φ = 241536.

The previous prime is 278237. The next prime is 278261. The reversal of 278239 is 932872.

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

It is not a de Polignac number, because 278239 - 2¹ = 278237 is a prime.

It is a super-2 number, since 2×278239² = 154833882242, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 278239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2²⁷⁸²³⁹ is an apocalyptic number.

278239 is a deficient number, since it is larger than the sum of its proper divisors (39281).

278239 is a wasteful number, since it uses less digits than its factorization.

278239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289.

The product of its digits is 6048, while the sum is 31.

The square root of 278239 is about 527.4836490357. The cubic root of 278239 is about 65.2838865299.

The spelling of 278239 in words is "two hundred seventy-eight thousand, two hundred thirty-nine".