138008777 has 2 divisors, whose sum is σ = 138008778. Its totient is φ = 138008776.

The previous prime is 138008749. The next prime is 138008851. The reversal of 138008777 is 777800831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119596096 + 18412681 = 10936^2 + 4291^2 .

It is an emirp because it is prime and its reverse (777800831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138008777 - 2¹⁶ = 137943241 is a prime.

It is not a weakly prime, because it can be changed into another prime (138007777) 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, 69004388 + 69004389.

It is an arithmetic number, because the mean of its divisors is an integer number (69004389).

Almost surely, 2^138008777 is an apocalyptic number.

It is an amenable number.

138008777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138008777 is an equidigital number, since it uses as much as digits as its factorization.

138008777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 138008777 is about 11747.7136924595. The cubic root of 138008777 is about 516.7758806702.

The spelling of 138008777 in words is "one hundred thirty-eight million, eight thousand, seven hundred seventy-seven".