1296447720 has 64 divisors (see below), whose sum is σ = 3912693120. Its totient is φ = 343643904.

The previous prime is 1296447709. The next prime is 1296447743. The reversal of 1296447720 is 277446921.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12307 + ... + 52386.

It is an arithmetic number, because the mean of its divisors is an integer number (61135830).

Almost surely, 2^1296447720 is an apocalyptic number.

1296447720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1296447720 is an abundant number, since it is smaller than the sum of its proper divisors (2616245400).

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

1296447720 is a wasteful number, since it uses less digits than its factorization.

1296447720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64874 (or 64870 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 1296447720 is about 36006.2177963751. The cubic root of 1296447720 is about 1090.3978908173.

The spelling of 1296447720 in words is "one billion, two hundred ninety-six million, four hundred forty-seven thousand, seven hundred twenty".