12423220 has 48 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 4691456.

The previous prime is 12423211. The next prime is 12423233. The reversal of 12423220 is 2232421.

It is a junction number, because it is equal to n+sod(n) for n = 12423194 and 12423203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51861 + ... + 52099.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^12423220 is an apocalyptic number.

12423220 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 12423220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13789440).

12423220 is an abundant number, since it is smaller than the sum of its proper divisors (15155660).

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

12423220 is a wasteful number, since it uses less digits than its factorization.

12423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12423220 is about 3524.6588487398. The cubic root of 12423220 is about 231.6032905213.

Adding to 12423220 its reverse (2232421), we get a palindrome (14655641).

The spelling of 12423220 in words is "twelve million, four hundred twenty-three thousand, two hundred twenty".