138169629 has 12 divisors (see below), whose sum is σ = 214930716. Its totient is φ = 85027392.

The previous prime is 138169597. The next prime is 138169639. The reversal of 138169629 is 926961831.

It is a happy number.

138169629 is a `hidden beast` number, since 1 + 3 + 8 + 16 + 9 + 629 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 68062500 + 70107129 = 8250^2 + 8373^2 .

It is not a de Polignac number, because 138169629 - 2⁵ = 138169597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138169639) 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 in 11 ways as a sum of consecutive naturals, for example, 590352 + ... + 590585.

It is an arithmetic number, because the mean of its divisors is an integer number (17910893).

Almost surely, 2^138169629 is an apocalyptic number.

It is an amenable number.

138169629 is a deficient number, since it is larger than the sum of its proper divisors (76761087).

138169629 is a wasteful number, since it uses less digits than its factorization.

138169629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180956 (or 1180953 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 138169629 is about 11754.5577968718. The cubic root of 138169629 is about 516.9765736074.

The spelling of 138169629 in words is "one hundred thirty-eight million, one hundred sixty-nine thousand, six hundred twenty-nine".