138451328 has 32 divisors (see below), whose sum is σ = 290343000. Its totient is φ = 65581056.

The previous prime is 138451321. The next prime is 138451343. The reversal of 138451328 is 823154831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138451321) 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, 26033 + ... + 30896.

Almost surely, 2^138451328 is an apocalyptic number.

It is an amenable number.

138451328 is an abundant number, since it is smaller than the sum of its proper divisors (151891672).

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

138451328 is an equidigital number, since it uses as much as digits as its factorization.

138451328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56962 (or 56950 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 138451328 is about 11766.5342391037. The cubic root of 138451328 is about 517.3276708441.

The spelling of 138451328 in words is "one hundred thirty-eight million, four hundred fifty-one thousand, three hundred twenty-eight".