1297312740 has 48 divisors (see below), whose sum is σ = 4036085760. Its totient is φ = 345949920.

The previous prime is 1297312733. The next prime is 1297312777. The reversal of 1297312740 is 472137921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1297312695 and 1297312704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1200676 + ... + 1201755.

It is an arithmetic number, because the mean of its divisors is an integer number (84085120).

Almost surely, 2^1297312740 is an apocalyptic number.

1297312740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297312740 is an abundant number, since it is smaller than the sum of its proper divisors (2738773020).

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

1297312740 is a wasteful number, since it uses less digits than its factorization.

1297312740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402449 (or 2402441 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 1297312740 is about 36018.2278853361. The cubic root of 1297312740 is about 1090.6403498249.

The spelling of 1297312740 in words is "one billion, two hundred ninety-seven million, three hundred twelve thousand, seven hundred forty".