138284636 has 48 divisors (see below), whose sum is σ = 285438720. Its totient is φ = 57386880.

The previous prime is 138284633. The next prime is 138284659. The reversal of 138284636 is 636482831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 138284593 and 138284602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138284633) 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 15 ways as a sum of consecutive naturals, for example, 186755 + ... + 187493.

It is an arithmetic number, because the mean of its divisors is an integer number (5946640).

Almost surely, 2^138284636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138284636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142719360).

138284636 is an abundant number, since it is smaller than the sum of its proper divisors (147154084).

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

138284636 is a wasteful number, since it uses less digits than its factorization.

138284636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954 (or 952 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 138284636 is about 11759.4487966061. The cubic root of 138284636 is about 517.1199708614.

The spelling of 138284636 in words is "one hundred thirty-eight million, two hundred eighty-four thousand, six hundred thirty-six".