12061809 has 24 divisors (see below), whose sum is σ = 17969952. Its totient is φ = 7793280.

The previous prime is 12061807. The next prime is 12061817. The reversal of 12061809 is 90816021.

It is not a de Polignac number, because 12061809 - 2¹ = 12061807 is a prime.

12061809 is a modest number, since divided by 1809 gives 1206 as remainder.

It is not an unprimeable number, because it can be changed into a prime (12061807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49929 + ... + 50169.

It is an arithmetic number, because the mean of its divisors is an integer number (748748).

Almost surely, 2^12061809 is an apocalyptic number.

It is an amenable number.

12061809 is a deficient number, since it is larger than the sum of its proper divisors (5908143).

12061809 is a wasteful number, since it uses less digits than its factorization.

12061809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 12061809 is about 3473.0115174010. The cubic root of 12061809 is about 229.3352513492.

The spelling of 12061809 in words is "twelve million, sixty-one thousand, eight hundred nine".