138807288 has 24 divisors (see below), whose sum is σ = 375936600. Its totient is φ = 46269072.

The previous prime is 138807281. The next prime is 138807289. The reversal of 138807288 is 882708831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138807281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 963868 + ... + 964011.

It is an arithmetic number, because the mean of its divisors is an integer number (15664025).

Almost surely, 2^138807288 is an apocalyptic number.

138807288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138807288 is an abundant number, since it is smaller than the sum of its proper divisors (237129312).

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

138807288 is a wasteful number, since it uses less digits than its factorization.

138807288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927891 (or 1927884 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 138807288 is about 11781.6504786044. The cubic root of 138807288 is about 517.7706432828.

The spelling of 138807288 in words is "one hundred thirty-eight million, eight hundred seven thousand, two hundred eighty-eight".