138957173 has 2 divisors, whose sum is σ = 138957174. Its totient is φ = 138957172.

The previous prime is 138957157. The next prime is 138957199. The reversal of 138957173 is 371759831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122367844 + 16589329 = 11062^2 + 4073^2 .

It is a cyclic number.

It is not a de Polignac number, because 138957173 - 2⁴ = 138957157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138957673) 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, 69478586 + 69478587.

It is an arithmetic number, because the mean of its divisors is an integer number (69478587).

Almost surely, 2^138957173 is an apocalyptic number.

It is an amenable number.

138957173 is a deficient number, since it is larger than the sum of its proper divisors (1).

138957173 is an equidigital number, since it uses as much as digits as its factorization.

138957173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 138957173 is about 11788.0097132637. The cubic root of 138957173 is about 517.9569402647.

The spelling of 138957173 in words is "one hundred thirty-eight million, nine hundred fifty-seven thousand, one hundred seventy-three".