1297820207 has 4 divisors (see below), whose sum is σ = 1315598640. Its totient is φ = 1280041776.

The previous prime is 1297820131. The next prime is 1297820219. The reversal of 1297820207 is 7020287921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7020287921 = 17 ⋅412958113.

It is a cyclic number.

It is not a de Polignac number, because 1297820207 - 2¹⁶ = 1297754671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297820297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8889107 + ... + 8889252.

It is an arithmetic number, because the mean of its divisors is an integer number (328899660).

Almost surely, 2^1297820207 is an apocalyptic number.

1297820207 is a deficient number, since it is larger than the sum of its proper divisors (17778433).

1297820207 is an equidigital number, since it uses as much as digits as its factorization.

1297820207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17778432.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 1297820207 is about 36025.2717824585. The cubic root of 1297820207 is about 1090.7825390902.

The spelling of 1297820207 in words is "one billion, two hundred ninety-seven million, eight hundred twenty thousand, two hundred seven".