278938 has 16 divisors (see below), whose sum is σ = 472320. Its totient is φ = 122400.

The previous prime is 278917. The next prime is 278947. The reversal of 278938 is 839872.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 278897 and 278906.

It is an unprimeable number.

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, 478 + ... + 886.

It is an arithmetic number, because the mean of its divisors is an integer number (29520).

2²⁷⁸⁹³⁸ is an apocalyptic number.

278938 is a deficient number, since it is larger than the sum of its proper divisors (193382).

278938 is a wasteful number, since it uses less digits than its factorization.

278938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453.

The product of its digits is 24192, while the sum is 37.

The square root of 278938 is about 528.1458131993. The cubic root of 278938 is about 65.3385101641.

The spelling of 278938 in words is "two hundred seventy-eight thousand, nine hundred thirty-eight".