138078129 has 24 divisors (see below), whose sum is σ = 214998528. Its totient is φ = 78593760.

The previous prime is 138078121. The next prime is 138078137. The reversal of 138078129 is 921870831.

It is an interprime number because it is at equal distance from previous prime (138078121) and next prime (138078137).

It is not a de Polignac number, because 138078129 - 2³ = 138078121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138078121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39024 + ... + 42414.

It is an arithmetic number, because the mean of its divisors is an integer number (8958272).

Almost surely, 2^138078129 is an apocalyptic number.

It is an amenable number.

138078129 is a deficient number, since it is larger than the sum of its proper divisors (76920399).

138078129 is a wasteful number, since it uses less digits than its factorization.

138078129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685 (or 3678 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 138078129 is about 11750.6650450092. The cubic root of 138078129 is about 516.8624293666.

The spelling of 138078129 in words is "one hundred thirty-eight million, seventy-eight thousand, one hundred twenty-nine".