123085209 has 8 divisors (see below), whose sum is σ = 176737792. Its totient is φ = 75744720.

The previous prime is 123085189. The next prime is 123085229. The reversal of 123085209 is 902580321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123085189) and next prime (123085229).

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

It is not a de Polignac number, because 123085209 - 2⁹ = 123084697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123085229) 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, 1577977 + ... + 1578054.

It is an arithmetic number, because the mean of its divisors is an integer number (22092224).

Almost surely, 2^123085209 is an apocalyptic number.

It is an amenable number.

123085209 is a deficient number, since it is larger than the sum of its proper divisors (53652583).

123085209 is a wasteful number, since it uses less digits than its factorization.

123085209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156047.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 123085209 is about 11094.3773597260. The cubic root of 123085209 is about 497.4337970710.

The spelling of 123085209 in words is "one hundred twenty-three million, eighty-five thousand, two hundred nine".