138706937 has 2 divisors, whose sum is σ = 138706938. Its totient is φ = 138706936.

The previous prime is 138706901. The next prime is 138706957. The reversal of 138706937 is 739607831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138674176 + 32761 = 11776^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 138706937 - 2¹⁸ = 138444793 is a prime.

It is a super-2 number, since 2×138706937² = 38479228743843938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138706957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69353468 + 69353469.

It is an arithmetic number, because the mean of its divisors is an integer number (69353469).

Almost surely, 2^138706937 is an apocalyptic number.

It is an amenable number.

138706937 is a deficient number, since it is larger than the sum of its proper divisors (1).

138706937 is an equidigital number, since it uses as much as digits as its factorization.

138706937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 138706937 is about 11777.3909249884. The cubic root of 138706937 is about 517.6458387695.

The spelling of 138706937 in words is "one hundred thirty-eight million, seven hundred six thousand, nine hundred thirty-seven".