1297770729 has 8 divisors (see below), whose sum is σ = 1730583552. Its totient is φ = 865069200.

The previous prime is 1297770703. The next prime is 1297770743. The reversal of 1297770729 is 9270777921.

It is a happy number.

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

It is not a de Polignac number, because 1297770729 - 2⁵ = 1297770697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1299770729) 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, 4879 + ... + 51179.

It is an arithmetic number, because the mean of its divisors is an integer number (216322944).

Almost surely, 2^1297770729 is an apocalyptic number.

It is an amenable number.

1297770729 is a deficient number, since it is larger than the sum of its proper divisors (432812823).

1297770729 is an equidigital number, since it uses as much as digits as its factorization.

1297770729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55647.

The product of its (nonzero) digits is 777924, while the sum is 51.

The square root of 1297770729 is about 36024.5850635368. The cubic root of 1297770729 is about 1090.7686772769.

The spelling of 1297770729 in words is "one billion, two hundred ninety-seven million, seven hundred seventy thousand, seven hundred twenty-nine".