12145809 has 16 divisors (see below), whose sum is σ = 18043200. Its totient is φ = 7215936.

The previous prime is 12145801. The next prime is 12145829. The reversal of 12145809 is 90854121.

It is a happy number.

It is not a de Polignac number, because 12145809 - 2³ = 12145801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12145801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4239 + ... + 6500.

It is an arithmetic number, because the mean of its divisors is an integer number (1127700).

Almost surely, 2^12145809 is an apocalyptic number.

It is an amenable number.

12145809 is a deficient number, since it is larger than the sum of its proper divisors (5897391).

12145809 is a wasteful number, since it uses less digits than its factorization.

12145809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10784.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 12145809 is about 3485.0837866542. The cubic root of 12145809 is about 229.8663937331.

The spelling of 12145809 in words is "twelve million, one hundred forty-five thousand, eight hundred nine".