138387432 has 16 divisors (see below), whose sum is σ = 345968640. Its totient is φ = 46129136.

The previous prime is 138387421. The next prime is 138387433. The reversal of 138387432 is 234783831.

It is not an unprimeable number, because it can be changed into a prime (138387433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883048 + ... + 2883095.

It is an arithmetic number, because the mean of its divisors is an integer number (21623040).

Almost surely, 2^138387432 is an apocalyptic number.

138387432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138387432 is an abundant number, since it is smaller than the sum of its proper divisors (207581208).

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

138387432 is a wasteful number, since it uses less digits than its factorization.

138387432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5766152 (or 5766148 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 138387432 is about 11763.8187677301. The cubic root of 138387432 is about 517.2480754713.

The spelling of 138387432 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, four hundred thirty-two".