138648755 has 8 divisors (see below), whose sum is σ = 190146912. Its totient is φ = 95073408.

The previous prime is 138648751. The next prime is 138648767. The reversal of 138648755 is 557846831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138648755 - 2² = 138648751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138648751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1980662 + ... + 1980731.

It is an arithmetic number, because the mean of its divisors is an integer number (23768364).

Almost surely, 2^138648755 is an apocalyptic number.

138648755 is a deficient number, since it is larger than the sum of its proper divisors (51498157).

138648755 is an equidigital number, since it uses as much as digits as its factorization.

138648755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961405.

The product of its digits is 806400, while the sum is 47.

The square root of 138648755 is about 11774.9205942121. The cubic root of 138648755 is about 517.5734514208.

The spelling of 138648755 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, seven hundred fifty-five".