138236 has 12 divisors (see below), whose sum is σ = 276528. Its totient is φ = 59232.

The previous prime is 138209. The next prime is 138239. The reversal of 138236 is 632831.

138236 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138239) by changing a digit.

138236 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2441 + ... + 2496.

It is an arithmetic number, because the mean of its divisors is an integer number (23044).

2¹³⁸²³⁶ is an apocalyptic number.

It is an amenable number.

138236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138236 is a wasteful number, since it uses less digits than its factorization.

138236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948 (or 4946 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 138236 is about 371.8010220535. The cubic root of 138236 is about 51.7059338442.

The spelling of 138236 in words is "one hundred thirty-eight thousand, two hundred thirty-six".