1297793280 has 144 divisors (see below), whose sum is σ = 4737043584. Its totient is φ = 296632320.

The previous prime is 1297793267. The next prime is 1297793293. The reversal of 1297793280 is 823977921.

It is an interprime number because it is at equal distance from previous prime (1297793267) and next prime (1297793293).

It is a super-2 number, since 2×1297793280² = 3368534795226316800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 2740 + ... + 51020.

It is an arithmetic number, because the mean of its divisors is an integer number (32896136).

Almost surely, 2^1297793280 is an apocalyptic number.

1297793280 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 1297793280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2368521792).

1297793280 is an abundant number, since it is smaller than the sum of its proper divisors (3439250304).

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

1297793280 is an equidigital number, since it uses as much as digits as its factorization.

1297793280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48312 (or 48298 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 1297793280 is about 36024.8980567607. The cubic root of 1297793280 is about 1090.7749952347.

The spelling of 1297793280 in words is "one billion, two hundred ninety-seven million, seven hundred ninety-three thousand, two hundred eighty".