138387577 has 2 divisors, whose sum is σ = 138387578. Its totient is φ = 138387576.

The previous prime is 138387563. The next prime is 138387581. The reversal of 138387577 is 775783831.

It is a happy number.

138387577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138203536 + 184041 = 11756^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 138387577 - 2¹⁵ = 138354809 is a prime.

It is a super-2 number, since 2×138387577² = 38302242935861858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138387577.

It is not a weakly prime, because it can be changed into another prime (138387077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69193788 + 69193789.

It is an arithmetic number, because the mean of its divisors is an integer number (69193789).

Almost surely, 2^138387577 is an apocalyptic number.

It is an amenable number.

138387577 is a deficient number, since it is larger than the sum of its proper divisors (1).

138387577 is an equidigital number, since it uses as much as digits as its factorization.

138387577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 138387577 is about 11763.8249306932. The cubic root of 138387577 is about 517.2482561258.

The spelling of 138387577 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, five hundred seventy-seven".