12013540 has 96 divisors (see below), whose sum is σ = 32659200. Its totient is φ = 3601920.

The previous prime is 12013531. The next prime is 12013541. The reversal of 12013540 is 4531021.

It is not an unprimeable number, because it can be changed into a prime (12013541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44526 + ... + 44794.

It is an arithmetic number, because the mean of its divisors is an integer number (340200).

Almost surely, 2^12013540 is an apocalyptic number.

12013540 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 12013540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16329600).

12013540 is an abundant number, since it is smaller than the sum of its proper divisors (20645660).

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

12013540 is a wasteful number, since it uses less digits than its factorization.

12013540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12013540 is about 3466.0553948257. The cubic root of 12013540 is about 229.0289240939.

Adding to 12013540 its reverse (4531021), we get a palindrome (16544561).

The spelling of 12013540 in words is "twelve million, thirteen thousand, five hundred forty".