1296847872 has 66 divisors (see below), whose sum is σ = 3744646698. Its totient is φ = 432279552.

The previous prime is 1296847841. The next prime is 1296847921. The reversal of 1296847872 is 2787486921.

It is a happy number.

1296847872 is a `hidden beast` number, since 12 + 96 + 8 + 478 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1289097216 + 7750656 = 35904^2 + 2784^2 .

It is a super-2 number, since 2×1296847872² = 3363628806221856768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61143 + ... + 79574.

Almost surely, 2^1296847872 is an apocalyptic number.

1296847872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1296847872 is an abundant number, since it is smaller than the sum of its proper divisors (2447798826).

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

1296847872 is a wasteful number, since it uses less digits than its factorization.

1296847872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140743 (or 140722 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 1296847872 is about 36011.7740745995. The cubic root of 1296847872 is about 1090.5100640033.

The spelling of 1296847872 in words is "one billion, two hundred ninety-six million, eight hundred forty-seven thousand, eight hundred seventy-two".