278949 has 16 divisors (see below), whose sum is σ = 414720. Its totient is φ = 165360.

The previous prime is 278947. The next prime is 278981. The reversal of 278949 is 949872.

It is not a de Polignac number, because 278949 - 2¹ = 278947 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278947) 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 15 ways as a sum of consecutive naturals, for example, 2554 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (25920).

2²⁷⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

278949 is a deficient number, since it is larger than the sum of its proper divisors (135771).

278949 is a wasteful number, since it uses less digits than its factorization.

278949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200.

The product of its digits is 36288, while the sum is 39.

The square root of 278949 is about 528.1562268875. The cubic root of 278949 is about 65.3393690338.

The spelling of 278949 in words is "two hundred seventy-eight thousand, nine hundred forty-nine".