138606129 has 12 divisors (see below), whose sum is σ = 203029632. Its totient is φ = 91102200.

The previous prime is 138606079. The next prime is 138606131. The reversal of 138606129 is 921606831.

138606129 is a `hidden beast` number, since 1 + 38 + 6 + 0 + 612 + 9 = 666.

It is not a de Polignac number, because 138606129 - 2⁷ = 138606001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138606093 and 138606102.

It is not an unprimeable number, because it can be changed into a prime (138606229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107817 + ... + 109094.

It is an arithmetic number, because the mean of its divisors is an integer number (16919136).

Almost surely, 2^138606129 is an apocalyptic number.

It is an amenable number.

138606129 is a deficient number, since it is larger than the sum of its proper divisors (64423503).

138606129 is a wasteful number, since it uses less digits than its factorization.

138606129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216988 (or 216985 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 138606129 is about 11773.1104216345. The cubic root of 138606129 is about 517.5204052726.

The spelling of 138606129 in words is "one hundred thirty-eight million, six hundred six thousand, one hundred twenty-nine".