138299928 has 128 divisors (see below), whose sum is σ = 391372800. Its totient is φ = 40435200.

The previous prime is 138299923. The next prime is 138299957. The reversal of 138299928 is 829992831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138299923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 763998 + ... + 764178.

It is an arithmetic number, because the mean of its divisors is an integer number (3057600).

Almost surely, 2^138299928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138299928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195686400).

138299928 is an abundant number, since it is smaller than the sum of its proper divisors (253072872).

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

138299928 is a wasteful number, since it uses less digits than its factorization.

138299928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its digits is 559872, while the sum is 51.

The square root of 138299928 is about 11760.0989791753. The cubic root of 138299928 is about 517.1390318054.

The spelling of 138299928 in words is "one hundred thirty-eight million, two hundred ninety-nine thousand, nine hundred twenty-eight".