138780937 has 2 divisors, whose sum is σ = 138780938. Its totient is φ = 138780936.

The previous prime is 138780913. The next prime is 138780949. The reversal of 138780937 is 739087831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111281401 + 27499536 = 10549^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 138780937 - 2¹¹ = 138778889 is a prime.

It is not a weakly prime, because it can be changed into another prime (138780337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69390468 + 69390469.

It is an arithmetic number, because the mean of its divisors is an integer number (69390469).

Almost surely, 2^138780937 is an apocalyptic number.

It is an amenable number.

138780937 is a deficient number, since it is larger than the sum of its proper divisors (1).

138780937 is an equidigital number, since it uses as much as digits as its factorization.

138780937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 138780937 is about 11780.5321187118. The cubic root of 138780937 is about 517.7378769013.

The spelling of 138780937 in words is "one hundred thirty-eight million, seven hundred eighty thousand, nine hundred thirty-seven".