278383 has 4 divisors (see below), whose sum is σ = 318160. Its totient is φ = 238608.

The previous prime is 278363. The next prime is 278387. The reversal of 278383 is 383872.

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 278383 - 2¹³ = 270191 is a prime.

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

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278387) 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, 19878 + ... + 19891.

It is an arithmetic number, because the mean of its divisors is an integer number (79540).

2²⁷⁸³⁸³ is an apocalyptic number.

278383 is a deficient number, since it is larger than the sum of its proper divisors (39777).

278383 is an equidigital number, since it uses as much as digits as its factorization.

278383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39776.

The product of its digits is 8064, while the sum is 31.

The square root of 278383 is about 527.6201285016. The cubic root of 278383 is about 65.2951469431.

The spelling of 278383 in words is "two hundred seventy-eight thousand, three hundred eighty-three".