138188473 has 2 divisors, whose sum is σ = 138188474. Its totient is φ = 138188472.

The previous prime is 138188441. The next prime is 138188521. The reversal of 138188473 is 374881831.

138188473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97061904 + 41126569 = 9852^2 + 6413^2 .

It is a cyclic number.

It is not a de Polignac number, because 138188473 - 2⁵ = 138188441 is a prime.

It is not a weakly prime, because it can be changed into another prime (138183473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69094236 + 69094237.

It is an arithmetic number, because the mean of its divisors is an integer number (69094237).

Almost surely, 2^138188473 is an apocalyptic number.

It is an amenable number.

138188473 is a deficient number, since it is larger than the sum of its proper divisors (1).

138188473 is an equidigital number, since it uses as much as digits as its factorization.

138188473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 138188473 is about 11755.3593309605. The cubic root of 138188473 is about 517.0000748254. Note that the first 4 decimals are identical.

The spelling of 138188473 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, four hundred seventy-three".