138641773 has 2 divisors, whose sum is σ = 138641774. Its totient is φ = 138641772.

The previous prime is 138641753. The next prime is 138641843. The reversal of 138641773 is 377146831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121815369 + 16826404 = 11037^2 + 4102^2 .

It is a cyclic number.

It is not a de Polignac number, because 138641773 - 2²⁵ = 105087341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138641753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69320886 + 69320887.

It is an arithmetic number, because the mean of its divisors is an integer number (69320887).

Almost surely, 2^138641773 is an apocalyptic number.

It is an amenable number.

138641773 is a deficient number, since it is larger than the sum of its proper divisors (1).

138641773 is an equidigital number, since it uses as much as digits as its factorization.

138641773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 138641773 is about 11774.6241128963. The cubic root of 138641773 is about 517.5647633791.

The spelling of 138641773 in words is "one hundred thirty-eight million, six hundred forty-one thousand, seven hundred seventy-three".