138332693 has 2 divisors, whose sum is σ = 138332694. Its totient is φ = 138332692.

The previous prime is 138332681. The next prime is 138332783. The reversal of 138332693 is 396233831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137780644 + 552049 = 11738^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 138332693 - 2⁸ = 138332437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138332653) 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, 69166346 + 69166347.

It is an arithmetic number, because the mean of its divisors is an integer number (69166347).

Almost surely, 2^138332693 is an apocalyptic number.

It is an amenable number.

138332693 is a deficient number, since it is larger than the sum of its proper divisors (1).

138332693 is an equidigital number, since it uses as much as digits as its factorization.

138332693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 38.

The square root of 138332693 is about 11761.4919546799. The cubic root of 138332693 is about 517.1798675039.

The spelling of 138332693 in words is "one hundred thirty-eight million, three hundred thirty-two thousand, six hundred ninety-three".