1296543520 has 24 divisors (see below), whose sum is σ = 3063084444. Its totient is φ = 518617344.

The previous prime is 1296543491. The next prime is 1296543559. The reversal of 1296543520 is 253456921.

It can be written as a sum of positive squares in 2 ways, for example, as 1284792336 + 11751184 = 35844^2 + 3428^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1296543520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4051539 + ... + 4051858.

Almost surely, 2^1296543520 is an apocalyptic number.

1296543520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1296543520 is an abundant number, since it is smaller than the sum of its proper divisors (1766540924).

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

1296543520 is an equidigital number, since it uses as much as digits as its factorization.

1296543520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8103412 (or 8103404 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1296543520 is about 36007.5480975864. The cubic root of 1296543520 is about 1090.4247481916.

The spelling of 1296543520 in words is "one billion, two hundred ninety-six million, five hundred forty-three thousand, five hundred twenty".