1299989836800 has 792 divisors, whose sum is σ = 5010091076952. Its totient is φ = 320864256000.

The previous prime is 1299989836793. The next prime is 1299989836801. The reversal of 1299989836800 is 86389899921.

It is a happy number.

1299989836800 is a `hidden beast` number, since 1 + 2 + 99 + 98 + 98 + 368 + 0 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 379495425024 + 920494411776 = 616032^2 + 959424^2 .

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 (1299989836801) 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 71 ways as a sum of consecutive naturals, for example, 238922080 + ... + 238927520.

Almost surely, 2^{1299989836800} is an apocalyptic number.

1299989836800 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 1299989836800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2505045538476).

1299989836800 is an abundant number, since it is smaller than the sum of its proper divisors (3710101240152).

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

1299989836800 is a wasteful number, since it uses less digits than its factorization.

1299989836800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555 (or 5529 counting only the distinct ones).

The product of its (nonzero) digits is 120932352, while the sum is 72.

The spelling of 1299989836800 in words is "one trillion, two hundred ninety-nine billion, nine hundred eighty-nine million, eight hundred thirty-six thousand, eight hundred".