1297028385 has 12 divisors (see below), whose sum is σ = 2248182612. Its totient is φ = 691748448.

The previous prime is 1297028363. The next prime is 1297028431. The reversal of 1297028385 is 5838207921.

It is a happy number.

1297028385 is a `hidden beast` number, since 1 + 297 + 0 + 283 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 737611281 + 559417104 = 27159^2 + 23652^2 .

It is not a de Polignac number, because 1297028385 - 2⁹ = 1297027873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 28822853 = 1297028385 / (1 + 2 + 9 + 7 + 0 + 2 + 8 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1297028385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14411382 + ... + 14411471.

It is an arithmetic number, because the mean of its divisors is an integer number (187348551).

Almost surely, 2^1297028385 is an apocalyptic number.

1297028385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297028385 is a deficient number, since it is larger than the sum of its proper divisors (951154227).

1297028385 is a wasteful number, since it uses less digits than its factorization.

1297028385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28822864 (or 28822861 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1297028385 is about 36014.2802926839. The cubic root of 1297028385 is about 1090.5606590177.

The spelling of 1297028385 in words is "one billion, two hundred ninety-seven million, twenty-eight thousand, three hundred eighty-five".