138188429 has 2 divisors, whose sum is σ = 138188430. Its totient is φ = 138188428.

The previous prime is 138188389. The next prime is 138188441. The reversal of 138188429 is 924881831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98208100 + 39980329 = 9910^2 + 6323^2 .

It is an emirp because it is prime and its reverse (924881831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138188429 - 2¹⁶ = 138122893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138188429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138188329) 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, 69094214 + 69094215.

It is an arithmetic number, because the mean of its divisors is an integer number (69094215).

Almost surely, 2^138188429 is an apocalyptic number.

It is an amenable number.

138188429 is a deficient number, since it is larger than the sum of its proper divisors (1).

138188429 is an equidigital number, since it uses as much as digits as its factorization.

138188429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 138188429 is about 11755.3574594735. The cubic root of 138188429 is about 517.0000199534. Note that the first 4 decimals are identical.

The spelling of 138188429 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, four hundred twenty-nine".