138708138 has 16 divisors (see below), whose sum is σ = 277791840. Its totient is φ = 46173456.

The previous prime is 138708137. The next prime is 138708149. The reversal of 138708138 is 831807831.

It is a junction number, because it is equal to n+sod(n) for n = 138708096 and 138708105.

It is not an unprimeable number, because it can be changed into a prime (138708137) 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, 10728 + ... + 19811.

It is an arithmetic number, because the mean of its divisors is an integer number (17361990).

Almost surely, 2^138708138 is an apocalyptic number.

138708138 is an abundant number, since it is smaller than the sum of its proper divisors (139083702).

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

138708138 is a wasteful number, since it uses less digits than its factorization.

138708138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31301.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 138708138 is about 11777.4419124019. The cubic root of 138708138 is about 517.6473327848.

The spelling of 138708138 in words is "one hundred thirty-eight million, seven hundred eight thousand, one hundred thirty-eight".