138133428 has 24 divisors (see below), whose sum is σ = 330173760. Its totient is φ = 44921280.

The previous prime is 138133421. The next prime is 138133451. The reversal of 138133428 is 824331831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138133421) 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 7 ways as a sum of consecutive naturals, for example, 139888 + ... + 140871.

It is an arithmetic number, because the mean of its divisors is an integer number (13757240).

Almost surely, 2^138133428 is an apocalyptic number.

It is an amenable number.

138133428 is an abundant number, since it is smaller than the sum of its proper divisors (192040332).

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

138133428 is a wasteful number, since it uses less digits than its factorization.

138133428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280807 (or 280805 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 138133428 is about 11753.0178252226. The cubic root of 138133428 is about 516.9314196813.

The spelling of 138133428 in words is "one hundred thirty-eight million, one hundred thirty-three thousand, four hundred twenty-eight".