12123420 has 96 divisors (see below), whose sum is σ = 35954688. Its totient is φ = 3048192.

The previous prime is 12123373. The next prime is 12123439. The reversal of 12123420 is 2432121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12123420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95397 + ... + 95523.

It is an arithmetic number, because the mean of its divisors is an integer number (374528).

Almost surely, 2^12123420 is an apocalyptic number.

12123420 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 12123420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17977344).

12123420 is an abundant number, since it is smaller than the sum of its proper divisors (23831268).

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

12123420 is a wasteful number, since it uses less digits than its factorization.

12123420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12123420 is about 3481.8701871265. The cubic root of 12123420 is about 229.7250653076.

Adding to 12123420 its reverse (2432121), we get a palindrome (14555541).

The spelling of 12123420 in words is "twelve million, one hundred twenty-three thousand, four hundred twenty".