278426 has 16 divisors (see below), whose sum is σ = 466560. Its totient is φ = 123840.

The previous prime is 278413. The next prime is 278437. The reversal of 278426 is 624872.

278426 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2²⁷⁸⁴²⁶ is an apocalyptic number.

278426 is the 431-st pentagonal number.

278426 is a deficient number, since it is larger than the sum of its proper divisors (188134).

278426 is a wasteful number, since it uses less digits than its factorization.

278426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469.

The product of its digits is 5376, while the sum is 29.

The square root of 278426 is about 527.6608759421. The cubic root of 278426 is about 65.2985086747.

The spelling of 278426 in words is "two hundred seventy-eight thousand, four hundred twenty-six".