1243440432 has 120 divisors (see below), whose sum is σ = 3762040464. Its totient is φ = 381123072.

The previous prime is 1243440383. The next prime is 1243440433. The reversal of 1243440432 is 2340443421.

It is a happy number.

It is a super-2 number, since 2×1243440432² = 3092288215864693248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1243440396 and 1243440405.

It is not an unprimeable number, because it can be changed into a prime (1243440433) 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 23 ways as a sum of consecutive naturals, for example, 547363 + ... + 549629.

Almost surely, 2^1243440432 is an apocalyptic number.

1243440432 is a gapful number since it is divisible by the number (12) 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 1243440432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881020232).

1243440432 is an abundant number, since it is smaller than the sum of its proper divisors (2518600032).

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

1243440432 is a wasteful number, since it uses less digits than its factorization.

1243440432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587 (or 2578 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 1243440432 is about 35262.4507372928. The cubic root of 1243440432 is about 1075.3297512287.

Adding to 1243440432 its reverse (2340443421), we get a palindrome (3583883853).

The spelling of 1243440432 in words is "one billion, two hundred forty-three million, four hundred forty thousand, four hundred thirty-two".