1305784979 has 2 divisors, whose sum is σ = 1305784980. Its totient is φ = 1305784978.

The previous prime is 1305784969. The next prime is 1305784993. The reversal of 1305784979 is 9794875031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1305784979 - 2²⁴ = 1289007763 is a prime.

It is a super-2 number, since 2×1305784979² = 3410148822764060882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1305784979.

It is not a weakly prime, because it can be changed into another prime (1305784919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652892489 + 652892490.

It is an arithmetic number, because the mean of its divisors is an integer number (652892490).

Almost surely, 2^1305784979 is an apocalyptic number.

1305784979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305784979 is an equidigital number, since it uses as much as digits as its factorization.

1305784979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 1305784979 is about 36135.6469293134. The cubic root of 1305784979 is about 1093.0093811966.

The spelling of 1305784979 in words is "one billion, three hundred five million, seven hundred eighty-four thousand, nine hundred seventy-nine".