139378079 has 2 divisors, whose sum is σ = 139378080. Its totient is φ = 139378078.

The previous prime is 139378069. The next prime is 139378103. The reversal of 139378079 is 970873931.

It is a weak prime.

It is an emirp because it is prime and its reverse (970873931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139378079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139378009) 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, 69689039 + 69689040.

It is an arithmetic number, because the mean of its divisors is an integer number (69689040).

Almost surely, 2^139378079 is an apocalyptic number.

139378079 is a deficient number, since it is larger than the sum of its proper divisors (1).

139378079 is an equidigital number, since it uses as much as digits as its factorization.

139378079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 139378079 is about 11805.8493552984. The cubic root of 139378079 is about 518.4793828460.

The spelling of 139378079 in words is "one hundred thirty-nine million, three hundred seventy-eight thousand, seventy-nine".