1297340928 has 160 divisors (see below), whose sum is σ = 4136193600. Its totient is φ = 399126528.

The previous prime is 1297340903. The next prime is 1297340959. The reversal of 1297340928 is 8290437921.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 176103 + ... + 183321.

It is an arithmetic number, because the mean of its divisors is an integer number (25851210).

Almost surely, 2^1297340928 is an apocalyptic number.

1297340928 is a gapful number since it is divisible by the number (18) 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 1297340928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2068096800).

1297340928 is an abundant number, since it is smaller than the sum of its proper divisors (2838852672).

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

1297340928 is an equidigital number, since it uses as much as digits as its factorization.

1297340928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259 (or 7237 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1297340928 is about 36018.6191850826. The cubic root of 1297340928 is about 1090.6482489090.

It can be divided in two parts, 1297 and 340928, that added together give a square (342225 = 585²).

The spelling of 1297340928 in words is "one billion, two hundred ninety-seven million, three hundred forty thousand, nine hundred twenty-eight".