12231620 has 24 divisors (see below), whose sum is σ = 26573400. Its totient is φ = 4723712.

The previous prime is 12231613. The next prime is 12231623. The reversal of 12231620 is 2613221.

12231620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4734976 + 7496644 = 2176^2 + 2738^2 .

It is a super-2 number, since 2×12231620² = 299225055648800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231623) 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, 9965 + ... + 11124.

It is an arithmetic number, because the mean of its divisors is an integer number (1107225).

Almost surely, 2^12231620 is an apocalyptic number.

12231620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12231620 is an abundant number, since it is smaller than the sum of its proper divisors (14341780).

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

12231620 is a wasteful number, since it uses less digits than its factorization.

12231620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21127 (or 21125 counting only the distinct ones).

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

The square root of 12231620 is about 3497.3733000639. The cubic root of 12231620 is about 230.4064646222.

Adding to 12231620 its reverse (2613221), we get a palindrome (14844841).

The spelling of 12231620 in words is "twelve million, two hundred thirty-one thousand, six hundred twenty".