138532638 has 8 divisors (see below), whose sum is σ = 277065288. Its totient is φ = 46177544.

The previous prime is 138532633. The next prime is 138532663. The reversal of 138532638 is 836235831.

It is a sphenic number, since it is the product of 3 distinct primes.

138532638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 138532596 and 138532605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138532633) 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 3 ways as a sum of consecutive naturals, for example, 11544381 + ... + 11544392.

It is an arithmetic number, because the mean of its divisors is an integer number (34633161).

Almost surely, 2^138532638 is an apocalyptic number.

138532638 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.

138532638 is a wasteful number, since it uses less digits than its factorization.

138532638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23088778.

The product of its digits is 103680, while the sum is 39.

The square root of 138532638 is about 11769.9888700032. The cubic root of 138532638 is about 517.4289234690.

The spelling of 138532638 in words is "one hundred thirty-eight million, five hundred thirty-two thousand, six hundred thirty-eight".