780838139 has 2 divisors, whose sum is σ = 780838140. Its totient is φ = 780838138.

The previous prime is 780838127. The next prime is 780838147. The reversal of 780838139 is 931838087.

It is a strong prime.

It is an emirp because it is prime and its reverse (931838087) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780838139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 780838093 and 780838102.

It is not a weakly prime, because it can be changed into another prime (780838189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390419069 + 390419070.

It is an arithmetic number, because the mean of its divisors is an integer number (390419070).

Almost surely, 2^780838139 is an apocalyptic number.

780838139 is a deficient number, since it is larger than the sum of its proper divisors (1).

780838139 is an equidigital number, since it uses as much as digits as its factorization.

780838139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 780838139 is about 27943.4811539293. The cubic root of 780838139 is about 920.8459999286.

The spelling of 780838139 in words is "seven hundred eighty million, eight hundred thirty-eight thousand, one hundred thirty-nine".