123009305 has 4 divisors (see below), whose sum is σ = 147611172. Its totient is φ = 98407440.

The previous prime is 123009269. The next prime is 123009323. The reversal of 123009305 is 503900321.

It is a happy number.

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 68293696 + 54715609 = 8264^2 + 7397^2 .

It is not a de Polignac number, because 123009305 - 2⁸ = 123009049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12300926 + ... + 12300935.

It is an arithmetic number, because the mean of its divisors is an integer number (36902793).

Almost surely, 2^123009305 is an apocalyptic number.

It is an amenable number.

123009305 is a deficient number, since it is larger than the sum of its proper divisors (24601867).

123009305 is an equidigital number, since it uses as much as digits as its factorization.

123009305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24601866.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 123009305 is about 11090.9560002734. The cubic root of 123009305 is about 497.3315238051.

Adding to 123009305 its reverse (503900321), we get a palindrome (626909626).

The spelling of 123009305 in words is "one hundred twenty-three million, nine thousand, three hundred five".