1297718385 has 32 divisors (see below), whose sum is σ = 2119434240. Its totient is φ = 677896128.

The previous prime is 1297718369. The next prime is 1297718399. The reversal of 1297718385 is 5838177921.

It is not a de Polignac number, because 1297718385 - 2⁴ = 1297718369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146184 + ... + 154806.

It is an arithmetic number, because the mean of its divisors is an integer number (66232320).

Almost surely, 2^1297718385 is an apocalyptic number.

1297718385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297718385 is a deficient number, since it is larger than the sum of its proper divisors (821715855).

1297718385 is a wasteful number, since it uses less digits than its factorization.

1297718385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8837.

The product of its digits is 846720, while the sum is 51.

The square root of 1297718385 is about 36023.8585523539. The cubic root of 1297718385 is about 1090.7540121382.

The spelling of 1297718385 in words is "one billion, two hundred ninety-seven million, seven hundred eighteen thousand, three hundred eighty-five".