138532608 has 54 divisors (see below), whose sum is σ = 399430304. Its totient is φ = 46176768.

The previous prime is 138532607. The next prime is 138532621. The reversal of 138532608 is 806235831.

138532608 is a `hidden beast` number, since 13 + 8 + 5 + 32 + 608 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138532607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27760 + ... + 32367.

Almost surely, 2^138532608 is an apocalyptic number.

138532608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138532608 is an abundant number, since it is smaller than the sum of its proper divisors (260897696).

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

138532608 is an equidigital number, since it uses as much as digits as its factorization.

138532608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60149 (or 60132 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 138532608 is about 11769.9875955755. The cubic root of 138532608 is about 517.4288861183.

It can be divided in two parts, 13853 and 2608, that added together give a palindrome (16461).

The spelling of 138532608 in words is "one hundred thirty-eight million, five hundred thirty-two thousand, six hundred eight".