138905597 has 2 divisors, whose sum is σ = 138905598. Its totient is φ = 138905596.

The previous prime is 138905587. The next prime is 138905617. The reversal of 138905597 is 795509831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 54007801 = 9214^2 + 7349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138905597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138905587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69452798 + 69452799.

It is an arithmetic number, because the mean of its divisors is an integer number (69452799).

Almost surely, 2^138905597 is an apocalyptic number.

It is an amenable number.

138905597 is a deficient number, since it is larger than the sum of its proper divisors (1).

138905597 is an equidigital number, since it uses as much as digits as its factorization.

138905597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 138905597 is about 11785.8218635783. The cubic root of 138905597 is about 517.8928498874.

The spelling of 138905597 in words is "one hundred thirty-eight million, nine hundred five thousand, five hundred ninety-seven".