12081940 has 48 divisors (see below), whose sum is σ = 28224000. Its totient is φ = 4314240.

The previous prime is 12081919. The next prime is 12081941. The reversal of 12081940 is 4918021.

12081940 = T₂₇ + T₂₈ + ... + T₄₁₆.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12081941) 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 15 ways as a sum of consecutive naturals, for example, 7311 + ... + 8809.

It is an arithmetic number, because the mean of its divisors is an integer number (588000).

Almost surely, 2^12081940 is an apocalyptic number.

12081940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12081940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14112000).

12081940 is an abundant number, since it is smaller than the sum of its proper divisors (16142060).

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

12081940 is a wasteful number, since it uses less digits than its factorization.

12081940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12081940 is about 3475.9085143312. The cubic root of 12081940 is about 229.4627662710.

Adding to 12081940 its reverse (4918021), we get a palindrome (16999961).

The spelling of 12081940 in words is "twelve million, eighty-one thousand, nine hundred forty".