278427 has 4 divisors (see below), whose sum is σ = 371240. Its totient is φ = 185616.

The previous prime is 278413. The next prime is 278437. The reversal of 278427 is 724872.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 278427 - 2⁶ = 278363 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

278427 is a lucky number.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 278394 and 278403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278427.

It is not an unprimeable number, because it can be changed into a prime (278437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46402 + ... + 46407.

It is an arithmetic number, because the mean of its divisors is an integer number (92810).

2²⁷⁸⁴²⁷ is an apocalyptic number.

278427 is a deficient number, since it is larger than the sum of its proper divisors (92813).

278427 is an equidigital number, since it uses as much as digits as its factorization.

278427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92812.

The product of its digits is 6272, while the sum is 30.

The square root of 278427 is about 527.6618235196. The cubic root of 278427 is about 65.2985868504.

It can be divided in two parts, 27 and 8427, that multiplied together give a square (227529 = 477²).

The spelling of 278427 in words is "two hundred seventy-eight thousand, four hundred twenty-seven".