12081840 has 40 divisors (see below), whose sum is σ = 37454448. Its totient is φ = 3221760.

The previous prime is 12081829. The next prime is 12081841. The reversal of 12081840 is 4818021.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 12081840.

It is not an unprimeable number, because it can be changed into a prime (12081841) 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 7 ways as a sum of consecutive naturals, for example, 24931 + ... + 25410.

Almost surely, 2^12081840 is an apocalyptic number.

12081840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12081840 is an abundant number, since it is smaller than the sum of its proper divisors (25372608).

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

12081840 is a wasteful number, since it uses less digits than its factorization.

12081840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50357 (or 50351 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 12081840 is about 3475.8941295730. The cubic root of 12081840 is about 229.4621331955.

Adding to 12081840 its reverse (4818021), we get a palindrome (16899861).

It can be divided in two parts, 12081 and 840, that added together give a palindrome (12921).

The spelling of 12081840 in words is "twelve million, eighty-one thousand, eight hundred forty".