12013530 has 64 divisors (see below), whose sum is σ = 30205440. Its totient is φ = 3055104.

The previous prime is 12013517. The next prime is 12013531. The reversal of 12013530 is 3531021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (12013531) 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, 87622 + ... + 87758.

It is an arithmetic number, because the mean of its divisors is an integer number (471960).

Almost surely, 2^12013530 is an apocalyptic number.

12013530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12013530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15102720).

12013530 is an abundant number, since it is smaller than the sum of its proper divisors (18191910).

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

12013530 is a wasteful number, since it uses less digits than its factorization.

12013530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 12013530 is about 3466.0539522633. The cubic root of 12013530 is about 229.0288605465.

Adding to 12013530 its reverse (3531021), we get a palindrome (15544551).

The spelling of 12013530 in words is "twelve million, thirteen thousand, five hundred thirty".