278431 has 4 divisors (see below), whose sum is σ = 285264. Its totient is φ = 271600.

The previous prime is 278413. The next prime is 278437. The reversal of 278431 is 134872.

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

It is a cyclic number.

It is not a de Polignac number, because 278431 - 2⁹ = 277919 is a prime.

It is a super-2 number, since 2×278431² = 155047643522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278396 and 278405.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3355 + ... + 3436.

It is an arithmetic number, because the mean of its divisors is an integer number (71316).

2²⁷⁸⁴³¹ is an apocalyptic number.

278431 is a deficient number, since it is larger than the sum of its proper divisors (6833).

278431 is an equidigital number, since it uses as much as digits as its factorization.

278431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6832.

The product of its digits is 1344, while the sum is 25.

The square root of 278431 is about 527.6656138124. The cubic root of 278431 is about 65.2988995513.

The spelling of 278431 in words is "two hundred seventy-eight thousand, four hundred thirty-one".