138895720 has 32 divisors (see below), whose sum is σ = 313067520. Its totient is φ = 55460160.

The previous prime is 138895711. The next prime is 138895721. The reversal of 138895720 is 27598831.

It is not an unprimeable number, because it can be changed into a prime (138895721) 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, 22489 + ... + 27991.

It is an arithmetic number, because the mean of its divisors is an integer number (9783360).

Almost surely, 2^138895720 is an apocalyptic number.

138895720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138895720 is an abundant number, since it is smaller than the sum of its proper divisors (174171800).

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

138895720 is a wasteful number, since it uses less digits than its factorization.

138895720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6145 (or 6141 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 138895720 is about 11785.4028357116. The cubic root of 138895720 is about 517.8805745266.

The spelling of 138895720 in words is "one hundred thirty-eight million, eight hundred ninety-five thousand, seven hundred twenty".