1296001526400 has 576 divisors, whose sum is σ = 5293005868800. Its totient is φ = 295783833600.

The previous prime is 1296001526387. The next prime is 1296001526423. The reversal of 1296001526400 is 46251006921.

1296001526400 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 0 + 0 + 1 + 5 + 2 + 640 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×1296001526400² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 144945930 + ... + 144954870.

It is an arithmetic number, because the mean of its divisors is an integer number (9189246300).

Almost surely, 2^{1296001526400} is an apocalyptic number.

1296001526400 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 1296001526400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2646502934400).

1296001526400 is an abundant number, since it is smaller than the sum of its proper divisors (3997004342400).

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

1296001526400 is a wasteful number, since it uses less digits than its factorization.

1296001526400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9697 (or 9677 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 1296001526400 in words is "one trillion, two hundred ninety-six billion, one million, five hundred twenty-six thousand, four hundred".