138612 has 12 divisors (see below), whose sum is σ = 323456. Its totient is φ = 46200.

The previous prime is 138599. The next prime is 138617. The reversal of 138612 is 216831.

138612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138617) by changing a digit.

138612 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5764 + ... + 5787.

2¹³⁸⁶¹² is an apocalyptic number.

138612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138612 is an abundant number, since it is smaller than the sum of its proper divisors (184844).

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

138612 is a wasteful number, since it uses less digits than its factorization.

138612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11558 (or 11556 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 138612 is about 372.3063254902. The cubic root of 138612 is about 51.7527712115.

The spelling of 138612 in words is "one hundred thirty-eight thousand, six hundred twelve".