138680837 has 2 divisors, whose sum is σ = 138680838. Its totient is φ = 138680836.

The previous prime is 138680833. The next prime is 138680851. The reversal of 138680837 is 738086831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127215841 + 11464996 = 11279^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 138680837 - 2² = 138680833 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138680833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69340418 + 69340419.

It is an arithmetic number, because the mean of its divisors is an integer number (69340419).

Almost surely, 2^138680837 is an apocalyptic number.

It is an amenable number.

138680837 is a deficient number, since it is larger than the sum of its proper divisors (1).

138680837 is an equidigital number, since it uses as much as digits as its factorization.

138680837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 138680837 is about 11776.2828175957. The cubic root of 138680837 is about 517.6133688628.

The spelling of 138680837 in words is "one hundred thirty-eight million, six hundred eighty thousand, eight hundred thirty-seven".