12089840 has 40 divisors (see below), whose sum is σ = 32125920. Its totient is φ = 4144896.

The previous prime is 12089821. The next prime is 12089843. The reversal of 12089840 is 4898021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 12089797 and 12089806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12089843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10235 + ... + 11354.

It is an arithmetic number, because the mean of its divisors is an integer number (803148).

Almost surely, 2^12089840 is an apocalyptic number.

12089840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12089840 is an abundant number, since it is smaller than the sum of its proper divisors (20036080).

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

12089840 is a wasteful number, since it uses less digits than its factorization.

12089840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21609 (or 21603 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 12089840 is about 3477.0447221743. The cubic root of 12089840 is about 229.5127681993.

The spelling of 12089840 in words is "twelve million, eighty-nine thousand, eight hundred forty".