12242640 has 80 divisors (see below), whose sum is σ = 39283200. Its totient is φ = 3150336.

The previous prime is 12242623. The next prime is 12242651. The reversal of 12242640 is 4624221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6081 + ... + 7839.

It is an arithmetic number, because the mean of its divisors is an integer number (491040).

Almost surely, 2^12242640 is an apocalyptic number.

12242640 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 12242640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19641600).

12242640 is an abundant number, since it is smaller than the sum of its proper divisors (27040560).

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

12242640 is a wasteful number, since it uses less digits than its factorization.

12242640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 12242640 is about 3498.9484134522. The cubic root of 12242640 is about 230.4756382639.

Adding to 12242640 its reverse (4624221), we get a palindrome (16866861).

The spelling of 12242640 in words is "twelve million, two hundred forty-two thousand, six hundred forty".