1243531432 has 128 divisors (see below), whose sum is σ = 2885621760. Its totient is φ = 494334720.

The previous prime is 1243531403. The next prime is 1243531433. The reversal of 1243531432 is 2341353421.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243531432.

It is not an unprimeable number, because it can be changed into a prime (1243531433) 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 31 ways as a sum of consecutive naturals, for example, 4393963 + ... + 4394245.

It is an arithmetic number, because the mean of its divisors is an integer number (22543920).

Almost surely, 2^1243531432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243531432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1442810880).

1243531432 is an abundant number, since it is smaller than the sum of its proper divisors (1642090328).

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

1243531432 is a wasteful number, since it uses less digits than its factorization.

1243531432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 499 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 1243531432 is about 35263.7410380691. The cubic root of 1243531432 is about 1075.3559829156.

Adding to 1243531432 its reverse (2341353421), we get a palindrome (3584884853).

The spelling of 1243531432 in words is "one billion, two hundred forty-three million, five hundred thirty-one thousand, four hundred thirty-two".