1296236544 has 136 divisors (see below), whose sum is σ = 3649016640. Its totient is φ = 408158208.

The previous prime is 1296236531. The next prime is 1296236593. The reversal of 1296236544 is 4456326921.

It is a junction number, because it is equal to n+sod(n) for n = 1296236496 and 1296236505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3735379 + ... + 3735725.

Almost surely, 2^1296236544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1296236544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824508320).

1296236544 is an abundant number, since it is smaller than the sum of its proper divisors (2352780096).

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

1296236544 is an frugal number, since it uses more digits than its factorization.

1296236544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 371 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The square root of 1296236544 is about 36003.2851834385. The cubic root of 1296236544 is about 1090.3386832958.

The spelling of 1296236544 in words is "one billion, two hundred ninety-six million, two hundred thirty-six thousand, five hundred forty-four".