1299378239 has 2 divisors, whose sum is σ = 1299378240. Its totient is φ = 1299378238.

The previous prime is 1299378233. The next prime is 1299378277. The reversal of 1299378239 is 9328739921.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9328739921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1299378239 is a prime.

It is a super-2 number, since 2×1299378239² = 3376767615973482242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299378233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649689119 + 649689120.

It is an arithmetic number, because the mean of its divisors is an integer number (649689120).

Almost surely, 2^1299378239 is an apocalyptic number.

1299378239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299378239 is an equidigital number, since it uses as much as digits as its factorization.

1299378239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 1299378239 is about 36046.8894497154. The cubic root of 1299378239 is about 1091.2188590244.

The spelling of 1299378239 in words is "one billion, two hundred ninety-nine million, three hundred seventy-eight thousand, two hundred thirty-nine".