138759977 has 2 divisors, whose sum is σ = 138759978. Its totient is φ = 138759976.

The previous prime is 138759941. The next prime is 138760003. The reversal of 138759977 is 779957831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136866601 + 1893376 = 11699^2 + 1376^2 .

It is an emirp because it is prime and its reverse (779957831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138759977 - 2⁸ = 138759721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138759877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69379988 + 69379989.

It is an arithmetic number, because the mean of its divisors is an integer number (69379989).

Almost surely, 2^138759977 is an apocalyptic number.

It is an amenable number.

138759977 is a deficient number, since it is larger than the sum of its proper divisors (1).

138759977 is an equidigital number, since it uses as much as digits as its factorization.

138759977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 56.

The square root of 138759977 is about 11779.6424818413. The cubic root of 138759977 is about 517.7118110441.

The spelling of 138759977 in words is "one hundred thirty-eight million, seven hundred fifty-nine thousand, nine hundred seventy-seven".