12409923 has 4 divisors (see below), whose sum is σ = 16546568. Its totient is φ = 8273280.

The previous prime is 12409919. The next prime is 12409931. The reversal of 12409923 is 32990421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12409923 - 2² = 12409919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12409913) 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 3 ways as a sum of consecutive naturals, for example, 2068318 + ... + 2068323.

It is an arithmetic number, because the mean of its divisors is an integer number (4136642).

Almost surely, 2^12409923 is an apocalyptic number.

12409923 is a deficient number, since it is larger than the sum of its proper divisors (4136645).

12409923 is an equidigital number, since it uses as much as digits as its factorization.

12409923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136644.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 12409923 is about 3522.7720618854. The cubic root of 12409923 is about 231.5206300315.

The spelling of 12409923 in words is "twelve million, four hundred nine thousand, nine hundred twenty-three".