278343979 has 2 divisors, whose sum is σ = 278343980. Its totient is φ = 278343978.

The previous prime is 278343937. The next prime is 278344013. The reversal of 278343979 is 979343872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278343979 - 2²¹ = 276246827 is a prime.

It is not a weakly prime, because it can be changed into another prime (278341979) 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 as a sum of consecutive naturals, namely, 139171989 + 139171990.

It is an arithmetic number, because the mean of its divisors is an integer number (139171990).

Almost surely, 2^278343979 is an apocalyptic number.

278343979 is a deficient number, since it is larger than the sum of its proper divisors (1).

278343979 is an equidigital number, since it uses as much as digits as its factorization.

278343979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 52.

The square root of 278343979 is about 16683.6440563805. The cubic root of 278343979 is about 652.9209598937.

It can be divided in two parts, 27834 and 3979, that added together give a palindrome (31813).

The spelling of 278343979 in words is "two hundred seventy-eight million, three hundred forty-three thousand, nine hundred seventy-nine".