1297729663 has 8 divisors (see below), whose sum is σ = 1407581280. Its totient is φ = 1191601920.

The previous prime is 1297729661. The next prime is 1297729669. The reversal of 1297729663 is 3669277921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1297729663 - 2¹ = 1297729661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1297729663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297729661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930243 + ... + 931636.

It is an arithmetic number, because the mean of its divisors is an integer number (175947660).

Almost surely, 2^1297729663 is an apocalyptic number.

1297729663 is a deficient number, since it is larger than the sum of its proper divisors (109851617).

1297729663 is a wasteful number, since it uses less digits than its factorization.

1297729663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861937.

The product of its digits is 1714608, while the sum is 52.

The square root of 1297729663 is about 36024.0150871610. The cubic root of 1297729663 is about 1090.7571719116.

The spelling of 1297729663 in words is "one billion, two hundred ninety-seven million, seven hundred twenty-nine thousand, six hundred sixty-three".