278118383 has 2 divisors, whose sum is σ = 278118384. Its totient is φ = 278118382.

The previous prime is 278118343. The next prime is 278118397. The reversal of 278118383 is 383811872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278118383 - 2⁶ = 278118319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278118383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278118343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139059191 + 139059192.

It is an arithmetic number, because the mean of its divisors is an integer number (139059192).

Almost surely, 2^278118383 is an apocalyptic number.

278118383 is a deficient number, since it is larger than the sum of its proper divisors (1).

278118383 is an equidigital number, since it uses as much as digits as its factorization.

278118383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 278118383 is about 16676.8816929305. The cubic root of 278118383 is about 652.7445161405.

The spelling of 278118383 in words is "two hundred seventy-eight million, one hundred eighteen thousand, three hundred eighty-three".