279439649 has 2 divisors, whose sum is σ = 279439650. Its totient is φ = 279439648.

The previous prime is 279439639. The next prime is 279439661. The reversal of 279439649 is 946934972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277389025 + 2050624 = 16655^2 + 1432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279439649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 279439649.

It is not a weakly prime, because it can be changed into another prime (279439609) 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, 139719824 + 139719825.

It is an arithmetic number, because the mean of its divisors is an integer number (139719825).

Almost surely, 2^279439649 is an apocalyptic number.

It is an amenable number.

279439649 is a deficient number, since it is larger than the sum of its proper divisors (1).

279439649 is an equidigital number, since it uses as much as digits as its factorization.

279439649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 53.

The square root of 279439649 is about 16716.4484565353. The cubic root of 279439649 is about 653.7765550452.

The spelling of 279439649 in words is "two hundred seventy-nine million, four hundred thirty-nine thousand, six hundred forty-nine".