138428317 has 2 divisors, whose sum is σ = 138428318. Its totient is φ = 138428316.

The previous prime is 138428249. The next prime is 138428321. The reversal of 138428317 is 713824831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123520996 + 14907321 = 11114^2 + 3861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138428317 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138428327) 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, 69214158 + 69214159.

It is an arithmetic number, because the mean of its divisors is an integer number (69214159).

Almost surely, 2^138428317 is an apocalyptic number.

It is an amenable number.

138428317 is a deficient number, since it is larger than the sum of its proper divisors (1).

138428317 is an equidigital number, since it uses as much as digits as its factorization.

138428317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 138428317 is about 11765.5563829340. The cubic root of 138428317 is about 517.2990088183.

The spelling of 138428317 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, three hundred seventeen".