1296372861 has 72 divisors (see below), whose sum is σ = 2225223000. Its totient is φ = 725034240.

The previous prime is 1296372841. The next prime is 1296372871. The reversal of 1296372861 is 1682736921.

1296372861 is a `hidden beast` number, since 1 + 2 + 9 + 637 + 2 + 8 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5336100 + 1291036761 = 2310^2 + 35931^2 .

It is not a de Polignac number, because 1296372861 - 2⁵ = 1296372829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296372841) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7162191 + ... + 7162371.

It is an arithmetic number, because the mean of its divisors is an integer number (30905875).

Almost surely, 2^1296372861 is an apocalyptic number.

It is an amenable number.

1296372861 is a deficient number, since it is larger than the sum of its proper divisors (928850139).

1296372861 is a wasteful number, since it uses less digits than its factorization.

1296372861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 449 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1296372861 is about 36005.1782525792. The cubic root of 1296372861 is about 1090.3769032974.

The spelling of 1296372861 in words is "one billion, two hundred ninety-six million, three hundred seventy-two thousand, eight hundred sixty-one".