138305140 has 24 divisors (see below), whose sum is σ = 290707200. Its totient is φ = 55271328.

The previous prime is 138305131. The next prime is 138305171. The reversal of 138305140 is 41503831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25509 + ... + 30451.

It is an arithmetic number, because the mean of its divisors is an integer number (12112800).

Almost surely, 2^138305140 is an apocalyptic number.

138305140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138305140 is an abundant number, since it is smaller than the sum of its proper divisors (152402060).

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

138305140 is a wasteful number, since it uses less digits than its factorization.

138305140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6351 (or 6349 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 138305140 is about 11760.3205738619. The cubic root of 138305140 is about 517.1455280604.

Adding to 138305140 its reverse (41503831), we get a palindrome (179808971).

The spelling of 138305140 in words is "one hundred thirty-eight million, three hundred five thousand, one hundred forty".