1299169872 has 240 divisors, whose sum is σ = 4882270848. Its totient is φ = 311454720.

The previous prime is 1299169853. The next prime is 1299169877. The reversal of 1299169872 is 2789619921.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299169877) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139638 + ... + 148650.

Almost surely, 2^1299169872 is an apocalyptic number.

1299169872 is a gapful number since it is divisible by the number (12) 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 1299169872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2441135424).

1299169872 is an abundant number, since it is smaller than the sum of its proper divisors (3583100976).

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

1299169872 is a wasteful number, since it uses less digits than its factorization.

1299169872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9058 (or 9049 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 1299169872 is about 36043.9991121962. Note that the first 3 decimals coincide. The cubic root of 1299169872 is about 1091.1605269832.

It can be divided in two parts, 1299 and 169872, that added together give a palindrome (171171).

The spelling of 1299169872 in words is "one billion, two hundred ninety-nine million, one hundred sixty-nine thousand, eight hundred seventy-two".