278743 has 2 divisors, whose sum is σ = 278744. Its totient is φ = 278742.

The previous prime is 278741. The next prime is 278753. The reversal of 278743 is 347872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278743 - 2¹ = 278741 is a prime.

Together with 278741, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139371 + 139372.

It is an arithmetic number, because the mean of its divisors is an integer number (139372).

2²⁷⁸⁷⁴³ is an apocalyptic number.

278743 is a deficient number, since it is larger than the sum of its proper divisors (1).

278743 is an equidigital number, since it uses as much as digits as its factorization.

278743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 31.

The square root of 278743 is about 527.9611728148. The cubic root of 278743 is about 65.3232809977.

The spelling of 278743 in words is "two hundred seventy-eight thousand, seven hundred forty-three".