138645320 has 32 divisors (see below), whose sum is σ = 340312320. Its totient is φ = 50416320.

The previous prime is 138645293. The next prime is 138645329. The reversal of 138645320 is 23546831.

It is not an unprimeable number, because it can be changed into a prime (138645329) 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 7 ways as a sum of consecutive naturals, for example, 157112 + ... + 157991.

It is an arithmetic number, because the mean of its divisors is an integer number (10634760).

Almost surely, 2^138645320 is an apocalyptic number.

138645320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138645320 is an abundant number, since it is smaller than the sum of its proper divisors (201667000).

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

138645320 is a wasteful number, since it uses less digits than its factorization.

138645320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315125 (or 315121 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 138645320 is about 11774.7747324524. The cubic root of 138645320 is about 517.5691771199.

The spelling of 138645320 in words is "one hundred thirty-eight million, six hundred forty-five thousand, three hundred twenty".