12403220 has 12 divisors (see below), whose sum is σ = 26046804. Its totient is φ = 4961280.

The previous prime is 12403199. The next prime is 12403243. The reversal of 12403220 is 2230421.

It can be written as a sum of positive squares in 2 ways, for example, as 5026564 + 7376656 = 2242^2 + 2716^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12403195 and 12403204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310061 + ... + 310100.

It is an arithmetic number, because the mean of its divisors is an integer number (2170567).

Almost surely, 2^12403220 is an apocalyptic number.

12403220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12403220 is an abundant number, since it is smaller than the sum of its proper divisors (13643584).

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

12403220 is a wasteful number, since it uses less digits than its factorization.

12403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620170 (or 620168 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 12403220 is about 3521.8205519305. The cubic root of 12403220 is about 231.4789386024.

Adding to 12403220 its reverse (2230421), we get a palindrome (14633641).

The spelling of 12403220 in words is "twelve million, four hundred three thousand, two hundred twenty".