123289409 has 4 divisors (see below), whose sum is σ = 125379120. Its totient is φ = 121199700.

The previous prime is 123289391. The next prime is 123289421. The reversal of 123289409 is 904982321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123289409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123289459) 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, 1044767 + ... + 1044884.

It is an arithmetic number, because the mean of its divisors is an integer number (31344780).

Almost surely, 2^123289409 is an apocalyptic number.

It is an amenable number.

123289409 is a deficient number, since it is larger than the sum of its proper divisors (2089711).

123289409 is an equidigital number, since it uses as much as digits as its factorization.

123289409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089710.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 123289409 is about 11103.5764058253. The cubic root of 123289409 is about 497.7087281856.

The spelling of 123289409 in words is "one hundred twenty-three million, two hundred eighty-nine thousand, four hundred nine".