1296449687 has 4 divisors (see below), whose sum is σ = 1396176600. Its totient is φ = 1196722776.

The previous prime is 1296449681. The next prime is 1296449719. The reversal of 1296449687 is 7869446921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1296449687 - 2⁸ = 1296449431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296449681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49863437 + ... + 49863462.

It is an arithmetic number, because the mean of its divisors is an integer number (349044150).

Almost surely, 2^1296449687 is an apocalyptic number.

1296449687 is a deficient number, since it is larger than the sum of its proper divisors (99726913).

1296449687 is an equidigital number, since it uses as much as digits as its factorization.

1296449687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99726912.

The product of its digits is 5225472, while the sum is 56.

The square root of 1296449687 is about 36006.2451110915. The cubic root of 1296449687 is about 1090.3984422759.

The spelling of 1296449687 in words is "one billion, two hundred ninety-six million, four hundred forty-nine thousand, six hundred eighty-seven".