139397789 has 2 divisors, whose sum is σ = 139397790. Its totient is φ = 139397788.

The previous prime is 139397777. The next prime is 139397803. The reversal of 139397789 is 987793931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122832889 + 16564900 = 11083^2 + 4070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139397789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139397729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69698894 + 69698895.

It is an arithmetic number, because the mean of its divisors is an integer number (69698895).

Almost surely, 2^139397789 is an apocalyptic number.

It is an amenable number.

139397789 is a deficient number, since it is larger than the sum of its proper divisors (1).

139397789 is an equidigital number, since it uses as much as digits as its factorization.

139397789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 56.

The square root of 139397789 is about 11806.6840814854. The cubic root of 139397789 is about 518.5038217608.

The spelling of 139397789 in words is "one hundred thirty-nine million, three hundred ninety-seven thousand, seven hundred eighty-nine".