138581085 has 8 divisors (see below), whose sum is σ = 221729760. Its totient is φ = 73909904.

The previous prime is 138581077. The next prime is 138581123. The reversal of 138581085 is 580185831.

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 138581085 - 2³ = 138581077 is a prime.

It is a congruent 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, 4619355 + ... + 4619384.

It is an arithmetic number, because the mean of its divisors is an integer number (27716220).

Almost surely, 2^138581085 is an apocalyptic number.

138581085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138581085 is a deficient number, since it is larger than the sum of its proper divisors (83148675).

138581085 is an equidigital number, since it uses as much as digits as its factorization.

138581085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9238747.

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 138581085 is about 11772.0467634137. The cubic root of 138581085 is about 517.4892340639.

The spelling of 138581085 in words is "one hundred thirty-eight million, five hundred eighty-one thousand, eighty-five".