278344427 has 2 divisors, whose sum is σ = 278344428. Its totient is φ = 278344426.

The previous prime is 278344379. The next prime is 278344441. The reversal of 278344427 is 724443872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278344427 - 2¹⁸ = 278082283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (278344127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139172213 + 139172214.

It is an arithmetic number, because the mean of its divisors is an integer number (139172214).

Almost surely, 2^278344427 is an apocalyptic number.

278344427 is a deficient number, since it is larger than the sum of its proper divisors (1).

278344427 is an equidigital number, since it uses as much as digits as its factorization.

278344427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 41.

The square root of 278344427 is about 16683.6574826985. The cubic root of 278344427 is about 652.9213101898.

The spelling of 278344427 in words is "two hundred seventy-eight million, three hundred forty-four thousand, four hundred twenty-seven".