138829938 has 16 divisors (see below), whose sum is σ = 299018496. Its totient is φ = 42716880.

The previous prime is 138829937. The next prime is 138829987. The reversal of 138829938 is 839928831.

It is not an unprimeable number, because it can be changed into a prime (138829937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889858 + ... + 890013.

It is an arithmetic number, because the mean of its divisors is an integer number (18688656).

Almost surely, 2^138829938 is an apocalyptic number.

138829938 is an abundant number, since it is smaller than the sum of its proper divisors (160188558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138829938 is a wasteful number, since it uses less digits than its factorization.

138829938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779889.

The product of its digits is 746496, while the sum is 51.

The square root of 138829938 is about 11782.6116799290. The cubic root of 138829938 is about 517.7988043096.

The spelling of 138829938 in words is "one hundred thirty-eight million, eight hundred twenty-nine thousand, nine hundred thirty-eight".