278406 has 12 divisors (see below), whose sum is σ = 603252. Its totient is φ = 92796.

The previous prime is 278393. The next prime is 278413. The reversal of 278406 is 604872.

It is a self number, because there is not a number n which added to its sum of digits gives 278406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7716 + ... + 7751.

It is an arithmetic number, because the mean of its divisors is an integer number (50271).

2²⁷⁸⁴⁰⁶ is an apocalyptic number.

278406 is an abundant number, since it is smaller than the sum of its proper divisors (324846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278406 is a wasteful number, since it uses less digits than its factorization.

278406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15475 (or 15472 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 278406 is about 527.6419240356. The cubic root of 278406 is about 65.2969451217.

The spelling of 278406 in words is "two hundred seventy-eight thousand, four hundred six".