138255937 has 2 divisors, whose sum is σ = 138255938. Its totient is φ = 138255936.

The previous prime is 138255919. The next prime is 138255947. The reversal of 138255937 is 739552831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90935296 + 47320641 = 9536^2 + 6879^2 .

It is a cyclic number.

It is not a de Polignac number, because 138255937 - 2⁷ = 138255809 is a prime.

It is a super-2 number, since 2×138255937² = 38229408231495938, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138255893 and 138255902.

It is not a weakly prime, because it can be changed into another prime (138255947) 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, 69127968 + 69127969.

It is an arithmetic number, because the mean of its divisors is an integer number (69127969).

Almost surely, 2^138255937 is an apocalyptic number.

It is an amenable number.

138255937 is a deficient number, since it is larger than the sum of its proper divisors (1).

138255937 is an equidigital number, since it uses as much as digits as its factorization.

138255937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The square root of 138255937 is about 11758.2284805153. The cubic root of 138255937 is about 517.0841947664.

The spelling of 138255937 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred thirty-seven".