138120924 has 24 divisors (see below), whose sum is σ = 322479360. Its totient is φ = 46012144.

The previous prime is 138120893. The next prime is 138120929. The reversal of 138120924 is 429021831.

138120924 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138120924² = 38154779293227552, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138120891 and 138120900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138120929) 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, 28717 + ... + 33179.

It is an arithmetic number, because the mean of its divisors is an integer number (13436640).

Almost surely, 2^138120924 is an apocalyptic number.

It is an amenable number.

138120924 is an abundant number, since it is smaller than the sum of its proper divisors (184358436).

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

138120924 is a wasteful number, since it uses less digits than its factorization.

138120924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049 (or 7047 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 138120924 is about 11752.4858647011. The cubic root of 138120924 is about 516.9158214644.

The spelling of 138120924 in words is "one hundred thirty-eight million, one hundred twenty thousand, nine hundred twenty-four".