12009140 has 144 divisors (see below), whose sum is σ = 33203520. Its totient is φ = 3594240.

The previous prime is 12009139. The next prime is 12009149. The reversal of 12009140 is 4190021.

12009140 = T₇₇ + T₇₈ + ... + T₄₁₆.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009149) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 632051 + ... + 632069.

It is an arithmetic number, because the mean of its divisors is an integer number (230580).

Almost surely, 2^12009140 is an apocalyptic number.

12009140 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 12009140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16601760).

12009140 is an abundant number, since it is smaller than the sum of its proper divisors (21194380).

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

12009140 is a wasteful number, since it uses less digits than its factorization.

12009140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12009140 is about 3465.4206093922. The cubic root of 12009140 is about 229.0009598048. Note that the first 3 decimals are identical.

Adding to 12009140 its reverse (4190021), we get a palindrome (16199161).

The spelling of 12009140 in words is "twelve million, nine thousand, one hundred forty".