138651855 has 8 divisors (see below), whose sum is σ = 221842992. Its totient is φ = 73947648.

The previous prime is 138651817. The next prime is 138651859. The reversal of 138651855 is 558156831.

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

It is not a de Polignac number, because 138651855 - 2⁷ = 138651727 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138651859) 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, 4621714 + ... + 4621743.

It is an arithmetic number, because the mean of its divisors is an integer number (27730374).

Almost surely, 2^138651855 is an apocalyptic number.

138651855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138651855 is a deficient number, since it is larger than the sum of its proper divisors (83191137).

138651855 is an equidigital number, since it uses as much as digits as its factorization.

138651855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9243465.

The product of its digits is 144000, while the sum is 42.

The square root of 138651855 is about 11775.0522291835. The cubic root of 138651855 is about 517.5773088079.

The spelling of 138651855 in words is "one hundred thirty-eight million, six hundred fifty-one thousand, eight hundred fifty-five".