1243644960 has 192 divisors, whose sum is σ = 4124639232. Its totient is φ = 314366976.

The previous prime is 1243644929. The next prime is 1243644973. The reversal of 1243644960 is 694463421.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1401637 + ... + 1402523.

It is an arithmetic number, because the mean of its divisors is an integer number (21482496).

Almost surely, 2^1243644960 is an apocalyptic number.

1243644960 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 1243644960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2062319616).

1243644960 is an abundant number, since it is smaller than the sum of its proper divisors (2880994272).

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

1243644960 is a wasteful number, since it uses less digits than its factorization.

1243644960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 1243644960 is about 35265.3507000852. The cubic root of 1243644960 is about 1075.3887067363.

The spelling of 1243644960 in words is "one billion, two hundred forty-three million, six hundred forty-four thousand, nine hundred sixty".