12009549 has 16 divisors (see below), whose sum is σ = 16401600. Its totient is φ = 7814400.

The previous prime is 12009541. The next prime is 12009551. The reversal of 12009549 is 94590021.

It is a happy number.

It is not a de Polignac number, because 12009549 - 2³ = 12009541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009541) 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, 29749 + ... + 30149.

It is an arithmetic number, because the mean of its divisors is an integer number (1025100).

Almost surely, 2^12009549 is an apocalyptic number.

It is an amenable number.

12009549 is a deficient number, since it is larger than the sum of its proper divisors (4392051).

12009549 is a wasteful number, since it uses less digits than its factorization.

12009549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 12009549 is about 3465.4796204855. The cubic root of 12009549 is about 229.0035595005.

The spelling of 12009549 in words is "twelve million, nine thousand, five hundred forty-nine".