1299340279 has 2 divisors, whose sum is σ = 1299340280. Its totient is φ = 1299340278.

The previous prime is 1299340271. The next prime is 1299340297. The reversal of 1299340279 is 9720439921.

It is a happy number.

Together with next prime (1299340297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1299340279 - 2³ = 1299340271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299340271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649670139 + 649670140.

It is an arithmetic number, because the mean of its divisors is an integer number (649670140).

Almost surely, 2^1299340279 is an apocalyptic number.

1299340279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299340279 is an equidigital number, since it uses as much as digits as its factorization.

1299340279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1299340279 is about 36046.3629094532. The cubic root of 1299340279 is about 1091.2082326417.

The spelling of 1299340279 in words is "one billion, two hundred ninety-nine million, three hundred forty thousand, two hundred seventy-nine".