1243133440 has 160 divisors (see below), whose sum is σ = 3189010176. Its totient is φ = 463626240.

The previous prime is 1243133329. The next prime is 1243133443. The reversal of 1243133440 is 443313421.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243133443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2531595 + ... + 2532085.

Almost surely, 2^1243133440 is an apocalyptic number.

1243133440 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 1243133440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1594505088).

1243133440 is an abundant number, since it is smaller than the sum of its proper divisors (1945876736).

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

1243133440 is an equidigital number, since it uses as much as digits as its factorization.

1243133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1243133440 is about 35258.0975096502. The cubic root of 1243133440 is about 1075.2412481814.

Adding to 1243133440 its reverse (443313421), we get a palindrome (1686446861).

The spelling of 1243133440 in words is "one billion, two hundred forty-three million, one hundred thirty-three thousand, four hundred forty".