12009540 has 24 divisors (see below), whose sum is σ = 33626880. Its totient is φ = 3202528.

The previous prime is 12009523. The next prime is 12009541. The reversal of 12009540 is 4590021.

It is not an unprimeable number, because it can be changed into a prime (12009541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100020 + ... + 100139.

It is an arithmetic number, because the mean of its divisors is an integer number (1401120).

Almost surely, 2^12009540 is an apocalyptic number.

12009540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12009540 is an abundant number, since it is smaller than the sum of its proper divisors (21617340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12009540 is a wasteful number, since it uses less digits than its factorization.

12009540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200171 (or 200169 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 12009540 is about 3465.4783219637. The cubic root of 12009540 is about 229.0035022951.

Adding to 12009540 its reverse (4590021), we get a palindrome (16599561).

The spelling of 12009540 in words is "twelve million, nine thousand, five hundred forty".