138886720 has 56 divisors (see below), whose sum is σ = 377976384. Its totient is φ = 47617536.

The previous prime is 138886717. The next prime is 138886723. The reversal of 138886720 is 27688831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138886717) and next prime (138886723).

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (138886723) 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, 28762 + ... + 33241.

Almost surely, 2^138886720 is an apocalyptic number.

138886720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138886720 is an abundant number, since it is smaller than the sum of its proper divisors (239089664).

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

138886720 is an equidigital number, since it uses as much as digits as its factorization.

138886720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62027 (or 62017 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 138886720 is about 11785.0210012541. The cubic root of 138886720 is about 517.8693886148.

The spelling of 138886720 in words is "one hundred thirty-eight million, eight hundred eighty-six thousand, seven hundred twenty".