12209540 has 24 divisors (see below), whose sum is σ = 29303232. Its totient is φ = 4186080.

The previous prime is 12209521. The next prime is 12209563. The reversal of 12209540 is 4590221.

It is a super-3 number, since 3×12209540³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43466 + ... + 43745.

It is an arithmetic number, because the mean of its divisors is an integer number (1220968).

Almost surely, 2^12209540 is an apocalyptic number.

12209540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12209540 is an abundant number, since it is smaller than the sum of its proper divisors (17093692).

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

12209540 is a wasteful number, since it uses less digits than its factorization.

12209540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87227 (or 87225 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12209540 is about 3494.2152194735. The cubic root of 12209540 is about 230.2677411338.

Adding to 12209540 its reverse (4590221), we get a palindrome (16799761).

The spelling of 12209540 in words is "twelve million, two hundred nine thousand, five hundred forty".