12423509 has 12 divisors (see below), whose sum is σ = 14659488. Its totient is φ = 10495800.

The previous prime is 12423491. The next prime is 12423539. The reversal of 12423509 is 90532421.

It is not a de Polignac number, because 12423509 - 2¹² = 12419413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12423539) 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 11 ways as a sum of consecutive naturals, for example, 1694 + ... + 5264.

It is an arithmetic number, because the mean of its divisors is an integer number (1221624).

Almost surely, 2^12423509 is an apocalyptic number.

It is an amenable number.

12423509 is a deficient number, since it is larger than the sum of its proper divisors (2235979).

12423509 is an equidigital number, since it uses as much as digits as its factorization.

12423509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656 (or 3649 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 12423509 is about 3524.6998453769. The cubic root of 12423509 is about 231.6050864280.

The spelling of 12423509 in words is "twelve million, four hundred twenty-three thousand, five hundred nine".