12613220 has 24 divisors (see below), whose sum is σ = 26557944. Its totient is φ = 5031936.

The previous prime is 12613193. The next prime is 12613229. The reversal of 12613220 is 2231621.

It can be written as a sum of positive squares in 4 ways, for example, as 8988004 + 3625216 = 2998^2 + 1904^2 .

It is not an unprimeable number, because it can be changed into a prime (12613229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10994 + ... + 12086.

It is an arithmetic number, because the mean of its divisors is an integer number (1106581).

Almost surely, 2^12613220 is an apocalyptic number.

12613220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12613220 is an abundant number, since it is smaller than the sum of its proper divisors (13944724).

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

12613220 is a wasteful number, since it uses less digits than its factorization.

12613220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 12613220 is about 3551.5095382105. The cubic root of 12613220 is about 232.7780309764.

Adding to 12613220 its reverse (2231621), we get a palindrome (14844841).

The spelling of 12613220 in words is "twelve million, six hundred thirteen thousand, two hundred twenty".