138420912 has 40 divisors (see below), whose sum is σ = 408672256. Its totient is φ = 39548736.

The previous prime is 138420911. The next prime is 138420929. The reversal of 138420912 is 219024831.

It is a self number, because there is not a number n which added to its sum of digits gives 138420912.

It is not an unprimeable number, because it can be changed into a prime (138420911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205648 + ... + 206319.

Almost surely, 2^138420912 is an apocalyptic number.

138420912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138420912 is an abundant number, since it is smaller than the sum of its proper divisors (270251344).

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

138420912 is a wasteful number, since it uses less digits than its factorization.

138420912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411985 (or 411979 counting only the distinct ones).

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

The square root of 138420912 is about 11765.2416889752. The cubic root of 138420912 is about 517.2897846279.

The spelling of 138420912 in words is "one hundred thirty-eight million, four hundred twenty thousand, nine hundred twelve".