1299645984 has 192 divisors, whose sum is σ = 4335206400. Its totient is φ = 331637760.

The previous prime is 1299645901. The next prime is 1299646001. The reversal of 1299645984 is 4895469921.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268417 + ... + 273215.

It is an arithmetic number, because the mean of its divisors is an integer number (22579200).

Almost surely, 2^1299645984 is an apocalyptic number.

1299645984 is a gapful number since it is divisible by the number (14) 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 1299645984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167603200).

1299645984 is an abundant number, since it is smaller than the sum of its proper divisors (3035560416).

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

1299645984 is a wasteful number, since it uses less digits than its factorization.

1299645984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4863 (or 4855 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 57.

The square root of 1299645984 is about 36050.6031017513. The cubic root of 1299645984 is about 1091.2938046969.

The spelling of 1299645984 in words is "one billion, two hundred ninety-nine million, six hundred forty-five thousand, nine hundred eighty-four".