138481752 has 16 divisors (see below), whose sum is σ = 346204440. Its totient is φ = 46160576.

The previous prime is 138481727. The next prime is 138481753. The reversal of 138481752 is 257184831.

138481752 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138481752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138481753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2885013 + ... + 2885060.

Almost surely, 2^138481752 is an apocalyptic number.

138481752 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138481752 is an abundant number, since it is smaller than the sum of its proper divisors (207722688).

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

138481752 is a wasteful number, since it uses less digits than its factorization.

138481752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770082 (or 5770078 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 138481752 is about 11767.8269871714. The cubic root of 138481752 is about 517.3655614746.

The spelling of 138481752 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, seven hundred fifty-two".