123278585 has 4 divisors (see below), whose sum is σ = 147934308. Its totient is φ = 98622864.

The previous prime is 123278581. The next prime is 123278609. The reversal of 123278585 is 585872321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25110121 + 98168464 = 5011^2 + 9908^2 .

It is a cyclic number.

It is not a de Polignac number, because 123278585 - 2² = 123278581 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123278581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12327854 + ... + 12327863.

It is an arithmetic number, because the mean of its divisors is an integer number (36983577).

Almost surely, 2^123278585 is an apocalyptic number.

It is an amenable number.

123278585 is a deficient number, since it is larger than the sum of its proper divisors (24655723).

123278585 is an equidigital number, since it uses as much as digits as its factorization.

123278585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24655722.

The product of its digits is 134400, while the sum is 41.

The square root of 123278585 is about 11103.0889846024. The cubic root of 123278585 is about 497.6941625740.

The spelling of 123278585 in words is "one hundred twenty-three million, two hundred seventy-eight thousand, five hundred eighty-five".