1297820209 has 8 divisors (see below), whose sum is σ = 1534368960. Its totient is φ = 1074057936.

The previous prime is 1297820131. The next prime is 1297820219. The reversal of 1297820209 is 9020287921.

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

It is not a de Polignac number, because 1297820209 - 2⁷ = 1297820081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297820219) 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, 3196399 + ... + 3196804.

It is an arithmetic number, because the mean of its divisors is an integer number (191796120).

Almost surely, 2^1297820209 is an apocalyptic number.

It is an amenable number.

1297820209 is a deficient number, since it is larger than the sum of its proper divisors (236548751).

1297820209 is an equidigital number, since it uses as much as digits as its factorization.

1297820209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393239.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1297820209 is about 36025.2718102168. The cubic root of 1297820209 is about 1090.7825396505.

The spelling of 1297820209 in words is "one billion, two hundred ninety-seven million, eight hundred twenty thousand, two hundred nine".