12240420 has 24 divisors (see below), whose sum is σ = 34273344. Its totient is φ = 3264096.

The previous prime is 12240419. The next prime is 12240433. The reversal of 12240420 is 2404221.

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 12240420.

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 7 ways as a sum of consecutive naturals, for example, 101944 + ... + 102063.

It is an arithmetic number, because the mean of its divisors is an integer number (1428056).

Almost surely, 2^12240420 is an apocalyptic number.

12240420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12240420 is an abundant number, since it is smaller than the sum of its proper divisors (22032924).

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

12240420 is a wasteful number, since it uses less digits than its factorization.

12240420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204019 (or 204017 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 12240420 is about 3498.6311608971. The cubic root of 12240420 is about 230.4617064418.

Adding to 12240420 its reverse (2404221), we get a palindrome (14644641).

The spelling of 12240420 in words is "twelve million, two hundred forty thousand, four hundred twenty".