1297361280 has 128 divisors (see below), whose sum is σ = 4146300000. Its totient is φ = 345047040.

The previous prime is 1297361269. The next prime is 1297361293. The reversal of 1297361280 is 821637921.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1038096 + ... + 1039344.

Almost surely, 2^1297361280 is an apocalyptic number.

1297361280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297361280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2073150000).

1297361280 is an abundant number, since it is smaller than the sum of its proper divisors (2848938720).

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

1297361280 is a wasteful number, since it uses less digits than its factorization.

1297361280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1297361280 is about 36018.9017045218. The cubic root of 1297361280 is about 1090.6539520506.

The spelling of 1297361280 in words is "one billion, two hundred ninety-seven million, three hundred sixty-one thousand, two hundred eighty".