1299999729600 has 2016 divisors, whose sum is σ = 5778130176000. Its totient is φ = 272520806400.

The previous prime is 1299999729527. The next prime is 1299999729601. The reversal of 1299999729600 is 69279999921.

1299999729600 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 9 + 9 + 9 + 7 + 2 + 9 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299999729601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 5829595089 + ... + 5829595311.

It is an arithmetic number, because the mean of its divisors is an integer number (2866136000).

Almost surely, 2^{1299999729600} is an apocalyptic number.

1299999729600 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 1299999729600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2889065088000).

1299999729600 is an abundant number, since it is smaller than the sum of its proper divisors (4478130446400).

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

1299999729600 is a wasteful number, since it uses less digits than its factorization.

1299999729600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 89282088, while the sum is 72.

The spelling of 1299999729600 in words is "one trillion, two hundred ninety-nine billion, nine hundred ninety-nine million, seven hundred twenty-nine thousand, six hundred".