1296449279 has 8 divisors (see below), whose sum is σ = 1315349280. Its totient is φ = 1277567200.

The previous prime is 1296449261. The next prime is 1296449299. The reversal of 1296449279 is 9729446921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1296449279 - 2²⁸ = 1028013823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1296449279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296449299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225857 + ... + 231525.

It is an arithmetic number, because the mean of its divisors is an integer number (164418660).

Almost surely, 2^1296449279 is an apocalyptic number.

1296449279 is a deficient number, since it is larger than the sum of its proper divisors (18900001).

1296449279 is an equidigital number, since it uses as much as digits as its factorization.

1296449279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961.

The product of its digits is 1959552, while the sum is 53.

The square root of 1296449279 is about 36006.2394454072. The cubic root of 1296449279 is about 1090.3983278910.

The spelling of 1296449279 in words is "one billion, two hundred ninety-six million, four hundred forty-nine thousand, two hundred seventy-nine".