138391288 has 96 divisors (see below), whose sum is σ = 336733200. Its totient is φ = 52835328.

The previous prime is 138391241. The next prime is 138391289. The reversal of 138391288 is 882193831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138391289) 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 23 ways as a sum of consecutive naturals, for example, 126070 + ... + 127162.

Almost surely, 2^138391288 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 138391288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168366600).

138391288 is an abundant number, since it is smaller than the sum of its proper divisors (198341912).

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

138391288 is a wasteful number, since it uses less digits than its factorization.

138391288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1138 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 138391288 is about 11763.9826589468. The cubic root of 138391288 is about 517.2528795927.

The spelling of 138391288 in words is "one hundred thirty-eight million, three hundred ninety-one thousand, two hundred eighty-eight".