138435129 has 16 divisors (see below), whose sum is σ = 234387840. Its totient is φ = 79105680.

The previous prime is 138435127. The next prime is 138435133. The reversal of 138435129 is 921534831.

138435129 is a `hidden beast` number, since 138 + 4 + 3 + 512 + 9 = 666.

It is not a de Polignac number, because 138435129 - 2¹ = 138435127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138435093 and 138435102.

It is not an unprimeable number, because it can be changed into a prime (138435127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366042 + ... + 366419.

It is an arithmetic number, because the mean of its divisors is an integer number (14649240).

Almost surely, 2^138435129 is an apocalyptic number.

It is an amenable number.

138435129 is a deficient number, since it is larger than the sum of its proper divisors (95952711).

138435129 is an equidigital number, since it uses as much as digits as its factorization.

138435129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732477 (or 732471 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 138435129 is about 11765.8458684448. The cubic root of 138435129 is about 517.3074940356.

The spelling of 138435129 in words is "one hundred thirty-eight million, four hundred thirty-five thousand, one hundred twenty-nine".