138961585 has 8 divisors (see below), whose sum is σ = 190575936. Its totient is φ = 95287920.

The previous prime is 138961577. The next prime is 138961619. The reversal of 138961585 is 585169831.

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

It is not a de Polignac number, because 138961585 - 2³ = 138961577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985131 + ... + 1985200.

It is an arithmetic number, because the mean of its divisors is an integer number (23821992).

Almost surely, 2^138961585 is an apocalyptic number.

It is an amenable number.

138961585 is a deficient number, since it is larger than the sum of its proper divisors (51614351).

138961585 is an equidigital number, since it uses as much as digits as its factorization.

138961585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970343.

The product of its digits is 259200, while the sum is 46.

The square root of 138961585 is about 11788.1968510880. The cubic root of 138961585 is about 517.9624220540.

The spelling of 138961585 in words is "one hundred thirty-eight million, nine hundred sixty-one thousand, five hundred eighty-five".