1297945305 has 12 divisors (see below), whose sum is σ = 2249771940. Its totient is φ = 692237472.

The previous prime is 1297945301. The next prime is 1297945349. The reversal of 1297945305 is 5035497921.

It is a happy number.

1297945305 is a `hidden beast` number, since 1 + 29 + 7 + 94 + 530 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 466430409 + 831514896 = 21597^2 + 28836^2 .

It is not a de Polignac number, because 1297945305 - 2² = 1297945301 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: 28843229 = 1297945305 / (1 + 2 + 9 + 7 + 9 + 4 + 5 + 3 + 0 + 5).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1297945301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14421570 + ... + 14421659.

It is an arithmetic number, because the mean of its divisors is an integer number (187480995).

Almost surely, 2^1297945305 is an apocalyptic number.

1297945305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297945305 is a deficient number, since it is larger than the sum of its proper divisors (951826635).

1297945305 is a wasteful number, since it uses less digits than its factorization.

1297945305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843240 (or 28843237 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 1297945305 is about 36027.0079940036. The cubic root of 1297945305 is about 1090.8175851182.

The spelling of 1297945305 in words is "one billion, two hundred ninety-seven million, nine hundred forty-five thousand, three hundred five".