138930877 has 2 divisors, whose sum is σ = 138930878. Its totient is φ = 138930876.

The previous prime is 138930863. The next prime is 138930881. The reversal of 138930877 is 778039831.

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., 137968516 + 962361 = 11746^2 + 981^2 .

It is an emirp because it is prime and its reverse (778039831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138930877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138930887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69465438 + 69465439.

It is an arithmetic number, because the mean of its divisors is an integer number (69465439).

Almost surely, 2^138930877 is an apocalyptic number.

It is an amenable number.

138930877 is a deficient number, since it is larger than the sum of its proper divisors (1).

138930877 is an equidigital number, since it uses as much as digits as its factorization.

138930877 is an evil number, because the sum of its binary digits is even.

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

The square root of 138930877 is about 11786.8942898458. The cubic root of 138930877 is about 517.9242657971.

The spelling of 138930877 in words is "one hundred thirty-eight million, nine hundred thirty thousand, eight hundred seventy-seven".