123606809 has 4 divisors (see below), whose sum is σ = 124881204. Its totient is φ = 122332416.

The previous prime is 123606803. The next prime is 123606823. The reversal of 123606809 is 908606321.

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 36240400 + 87366409 = 6020^2 + 9347^2 .

It is a cyclic number.

It is not a de Polignac number, because 123606809 - 2⁴ = 123606793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123606803) 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, 637052 + ... + 637245.

It is an arithmetic number, because the mean of its divisors is an integer number (31220301).

Almost surely, 2^123606809 is an apocalyptic number.

It is an amenable number.

123606809 is a deficient number, since it is larger than the sum of its proper divisors (1274395).

123606809 is an equidigital number, since it uses as much as digits as its factorization.

123606809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274394.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 123606809 is about 11117.8599109721. The cubic root of 123606809 is about 498.1354676811.

The spelling of 123606809 in words is "one hundred twenty-three million, six hundred six thousand, eight hundred nine".