12372409 has 4 divisors (see below), whose sum is σ = 14139904. Its totient is φ = 10604916.

The previous prime is 12372403. The next prime is 12372431. The reversal of 12372409 is 90427321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90427321 = 659 ⋅137219.

It is not a de Polignac number, because 12372409 - 2⁵ = 12372377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12372403) 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, 883737 + ... + 883750.

It is an arithmetic number, because the mean of its divisors is an integer number (3534976).

Almost surely, 2^12372409 is an apocalyptic number.

It is an amenable number.

12372409 is a deficient number, since it is larger than the sum of its proper divisors (1767495).

12372409 is an equidigital number, since it uses as much as digits as its factorization.

12372409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767494.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 12372409 is about 3517.4435318851. The cubic root of 12372409 is about 231.2871063904.

The spelling of 12372409 in words is "twelve million, three hundred seventy-two thousand, four hundred nine".