12317220 has 72 divisors (see below), whose sum is σ = 38296440. Its totient is φ = 3202560.

The previous prime is 12317209. The next prime is 12317233. The reversal of 12317220 is 2271321.

It can be written as a sum of positive squares in 4 ways, for example, as 39204 + 12278016 = 198^2 + 3504^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12317193 and 12317202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6546 + ... + 8214.

It is an arithmetic number, because the mean of its divisors is an integer number (531895).

Almost surely, 2^12317220 is an apocalyptic number.

12317220 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 12317220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19148220).

12317220 is an abundant number, since it is smaller than the sum of its proper divisors (25979220).

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

12317220 is a wasteful number, since it uses less digits than its factorization.

12317220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1720 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 12317220 is about 3509.5897196111. The cubic root of 12317220 is about 230.9426967549.

Adding to 12317220 its reverse (2271321), we get a palindrome (14588541).

The spelling of 12317220 in words is "twelve million, three hundred seventeen thousand, two hundred twenty".