138732173 has 2 divisors, whose sum is σ = 138732174. Its totient is φ = 138732172.

The previous prime is 138732169. The next prime is 138732199. The reversal of 138732173 is 371237831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74684164 + 64048009 = 8642^2 + 8003^2 .

It is a cyclic number.

It is not a de Polignac number, because 138732173 - 2² = 138732169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138732103) 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, 69366086 + 69366087.

It is an arithmetic number, because the mean of its divisors is an integer number (69366087).

Almost surely, 2^138732173 is an apocalyptic number.

It is an amenable number.

138732173 is a deficient number, since it is larger than the sum of its proper divisors (1).

138732173 is an equidigital number, since it uses as much as digits as its factorization.

138732173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 138732173 is about 11778.4622510751. The cubic root of 138732173 is about 517.6772299373.

The spelling of 138732173 in words is "one hundred thirty-eight million, seven hundred thirty-two thousand, one hundred seventy-three".