138877597 has 2 divisors, whose sum is σ = 138877598. Its totient is φ = 138877596.

The previous prime is 138877579. The next prime is 138877637. The reversal of 138877597 is 795778831.

It is a happy number.

Together with previous prime (138877579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136282276 + 2595321 = 11674^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 138877597 - 2¹¹ = 138875549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138877507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69438798 + 69438799.

It is an arithmetic number, because the mean of its divisors is an integer number (69438799).

Almost surely, 2^138877597 is an apocalyptic number.

It is an amenable number.

138877597 is a deficient number, since it is larger than the sum of its proper divisors (1).

138877597 is an equidigital number, since it uses as much as digits as its factorization.

138877597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 55.

The square root of 138877597 is about 11784.6339357657. The cubic root of 138877597 is about 517.8580493356.

The spelling of 138877597 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, five hundred ninety-seven".