278978459 has 2 divisors, whose sum is σ = 278978460. Its totient is φ = 278978458.

The previous prime is 278978429. The next prime is 278978509. The reversal of 278978459 is 954879872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278978459 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 278978398 and 278978407.

It is not a weakly prime, because it can be changed into another prime (278978429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139489229 + 139489230.

It is an arithmetic number, because the mean of its divisors is an integer number (139489230).

Almost surely, 2^278978459 is an apocalyptic number.

278978459 is a deficient number, since it is larger than the sum of its proper divisors (1).

278978459 is an equidigital number, since it uses as much as digits as its factorization.

278978459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 59.

The square root of 278978459 is about 16702.6482630749. The cubic root of 278978459 is about 653.4166905362.

The spelling of 278978459 in words is "two hundred seventy-eight million, nine hundred seventy-eight thousand, four hundred fifty-nine".