138120612 has 96 divisors (see below), whose sum is σ = 392448000. Its totient is φ = 37721376.

The previous prime is 138120611. The next prime is 138120617. The reversal of 138120612 is 216021831.

It is not an unprimeable number, because it can be changed into a prime (138120611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93939 + ... + 95397.

It is an arithmetic number, because the mean of its divisors is an integer number (4088000).

Almost surely, 2^138120612 is an apocalyptic number.

138120612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138120612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196224000).

138120612 is an abundant number, since it is smaller than the sum of its proper divisors (254327388).

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

138120612 is a wasteful number, since it uses less digits than its factorization.

138120612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1494 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 138120612 is about 11752.4725909061. The cubic root of 138120612 is about 516.9154322454.

The spelling of 138120612 in words is "one hundred thirty-eight million, one hundred twenty thousand, six hundred twelve".