138576920 has 16 divisors (see below), whose sum is σ = 311798160. Its totient is φ = 55430752.

The previous prime is 138576901. The next prime is 138576923. The reversal of 138576920 is 29675831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138576923) 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 in 3 ways as a sum of consecutive naturals, for example, 1732172 + ... + 1732251.

It is an arithmetic number, because the mean of its divisors is an integer number (19487385).

Almost surely, 2^138576920 is an apocalyptic number.

138576920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138576920 is an abundant number, since it is smaller than the sum of its proper divisors (173221240).

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

138576920 is a wasteful number, since it uses less digits than its factorization.

138576920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464434 (or 3464430 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 138576920 is about 11771.8698599670. The cubic root of 138576920 is about 517.4840497001.

The spelling of 138576920 in words is "one hundred thirty-eight million, five hundred seventy-six thousand, nine hundred twenty".