12134540 has 48 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 4178880.

The previous prime is 12134531. The next prime is 12134543. The reversal of 12134540 is 4543121.

It is a super-2 number, since 2×12134540² = 294494122023200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (12134543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2729 + ... + 5631.

It is an arithmetic number, because the mean of its divisors is an integer number (609840).

Almost surely, 2^12134540 is an apocalyptic number.

12134540 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 12134540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14636160).

12134540 is an abundant number, since it is smaller than the sum of its proper divisors (17137780).

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

12134540 is a wasteful number, since it uses less digits than its factorization.

12134540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2942 (or 2940 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12134540 is about 3483.4666641149. The cubic root of 12134540 is about 229.7952809752.

Adding to 12134540 its reverse (4543121), we get a palindrome (16677661).

The spelling of 12134540 in words is "twelve million, one hundred thirty-four thousand, five hundred forty".