12780139 has 2 divisors, whose sum is σ = 12780140. Its totient is φ = 12780138.

The previous prime is 12780127. The next prime is 12780143. The reversal of 12780139 is 93108721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12780139 - 2¹⁷ = 12649067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12780139.

It is not a weakly prime, because it can be changed into another prime (12780149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390069 + 6390070.

It is an arithmetic number, because the mean of its divisors is an integer number (6390070).

Almost surely, 2^12780139 is an apocalyptic number.

12780139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780139 is an equidigital number, since it uses as much as digits as its factorization.

12780139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12780139 is about 3574.9320273258. The cubic root of 12780139 is about 233.8003691011.

The spelling of 12780139 in words is "twelve million, seven hundred eighty thousand, one hundred thirty-nine".