138663185 has 8 divisors (see below), whose sum is σ = 167456616. Its totient is φ = 110223360.

The previous prime is 138663167. The next prime is 138663191. The reversal of 138663185 is 581366831.

It can be written as a sum of positive squares in 4 ways, for example, as 11785489 + 126877696 = 3433^2 + 11264^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-138663185 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 87536 + ... + 89105.

It is an arithmetic number, because the mean of its divisors is an integer number (20932077).

Almost surely, 2^138663185 is an apocalyptic number.

It is an amenable number.

138663185 is a deficient number, since it is larger than the sum of its proper divisors (28793431).

138663185 is a wasteful number, since it uses less digits than its factorization.

138663185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176803.

The product of its digits is 103680, while the sum is 41.

The square root of 138663185 is about 11775.5333212556. The cubic root of 138663185 is about 517.5914064464.

The spelling of 138663185 in words is "one hundred thirty-eight million, six hundred sixty-three thousand, one hundred eighty-five".