12243440 has 40 divisors (see below), whose sum is σ = 31056048. Its totient is φ = 4451840.

The previous prime is 12243431. The next prime is 12243443. The reversal of 12243440 is 4434221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12243443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6077 + ... + 7836.

Almost surely, 2^12243440 is an apocalyptic number.

12243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12243440 is an abundant number, since it is smaller than the sum of its proper divisors (18812608).

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

12243440 is a wasteful number, since it uses less digits than its factorization.

12243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13937 (or 13931 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 12243440 is about 3499.0627316469. The cubic root of 12243440 is about 230.4806583275.

Adding to 12243440 its reverse (4434221), we get a palindrome (16677661).

It can be divided in two parts, 1224 and 3440, that added together give a palindrome (4664).

The spelling of 12243440 in words is "twelve million, two hundred forty-three thousand, four hundred forty".