278889 has 8 divisors (see below), whose sum is σ = 400512. Its totient is φ = 171600.

The previous prime is 278881. The next prime is 278891. The reversal of 278889 is 988872.

It is a happy number.

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

It is not a de Polignac number, because 278889 - 2³ = 278881 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 278889.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278881) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3537 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (50064).

2²⁷⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

278889 is a deficient number, since it is larger than the sum of its proper divisors (121623).

278889 is a wasteful number, since it uses less digits than its factorization.

278889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167.

The product of its digits is 64512, while the sum is 42.

The square root of 278889 is about 528.0994224576. The cubic root of 278889 is about 65.3346840158.

The spelling of 278889 in words is "two hundred seventy-eight thousand, eight hundred eighty-nine".