1299026560 has 128 divisors (see below), whose sum is σ = 3423087360.
Its totient is φ = 468357120.
The previous prime is 1299026557. The next prime is 1299026563. The reversal of 1299026560 is 656209921.
It is an interprime number because it is at equal distance from previous prime (1299026557) and next prime (1299026563).
It is a tau number, because it is divible by the number of its divisors (128).
It is a Harshad number since it is a multiple of its sum of digits (40).
It is not an unprimeable number, because it can be changed into a prime (1299026563) by changing a digit.
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 15 ways as a sum of consecutive naturals, for example, 355945 + ... + 359575.
It is an arithmetic number, because the mean of its divisors is an integer number (26742870).
Almost surely, 21299026560 is an apocalyptic number.
1299026560 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 1299026560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711543680).
1299026560 is an abundant number, since it is smaller than the sum of its proper divisors (2124060800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1299026560 is a wasteful number, since it uses less digits than its factorization.
1299026560 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3706 (or 3694 counting only the distinct ones).
The product of its (nonzero) digits is 58320, while the sum is 40.
The square root of 1299026560 is about 36042.0110426707.
The cubic root of 1299026560 is about 1091.1204033752.
The spelling of 1299026560 in words is "one billion, two hundred ninety-nine million, twenty-six thousand, five hundred sixty".