279790393 has 2 divisors, whose sum is σ = 279790394. Its totient is φ = 279790392.

The previous prime is 279790391. The next prime is 279790451. The reversal of 279790393 is 393097972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243453609 + 36336784 = 15603^2 + 6028^2 .

It is a cyclic number.

It is not a de Polignac number, because 279790393 - 2¹ = 279790391 is a prime.

Together with 279790391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (279790391) 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, 139895196 + 139895197.

It is an arithmetic number, because the mean of its divisors is an integer number (139895197).

Almost surely, 2^279790393 is an apocalyptic number.

It is an amenable number.

279790393 is a deficient number, since it is larger than the sum of its proper divisors (1).

279790393 is an equidigital number, since it uses as much as digits as its factorization.

279790393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 642978, while the sum is 49.

The square root of 279790393 is about 16726.9361510110. The cubic root of 279790393 is about 654.0499740482.

The spelling of 279790393 in words is "two hundred seventy-nine million, seven hundred ninety thousand, three hundred ninety-three".