1296665448 has 64 divisors (see below), whose sum is σ = 3511347840. Its totient is φ = 396651264.

The previous prime is 1296665437. The next prime is 1296665449. The reversal of 1296665448 is 8445666921.

It is a self number, because there is not a number n which added to its sum of digits gives 1296665448.

It is not an unprimeable number, because it can be changed into a prime (1296665449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41965 + ... + 65987.

It is an arithmetic number, because the mean of its divisors is an integer number (54864810).

Almost surely, 2^1296665448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1296665448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1755673920).

1296665448 is an abundant number, since it is smaller than the sum of its proper divisors (2214682392).

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

1296665448 is a wasteful number, since it uses less digits than its factorization.

1296665448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24218 (or 24214 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The square root of 1296665448 is about 36009.2411472389. The cubic root of 1296665448 is about 1090.4589285949.

The spelling of 1296665448 in words is "one billion, two hundred ninety-six million, six hundred sixty-five thousand, four hundred forty-eight".