138508288 has 24 divisors (see below), whose sum is σ = 276953040. Its totient is φ = 69253120.

The previous prime is 138508283. The next prime is 138508319. The reversal of 138508288 is 882805831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138508283) 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 as a sum of consecutive naturals, namely, 31768 + ... + 35863.

It is an arithmetic number, because the mean of its divisors is an integer number (11539710).

Almost surely, 2^138508288 is an apocalyptic number.

It is an amenable number.

138508288 is a deficient number, since it is larger than the sum of its proper divisors (138444752).

138508288 is an frugal number, since it uses more digits than its factorization.

138508288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67653 (or 67633 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 138508288 is about 11768.9544140506. The cubic root of 138508288 is about 517.3986053848.

The spelling of 138508288 in words is "one hundred thirty-eight million, five hundred eight thousand, two hundred eighty-eight".