1272868859 has 4 divisors (see below), whose sum is σ = 1272949104. Its totient is φ = 1272788616.

The previous prime is 1272868853. The next prime is 1272868867. The reversal of 1272868859 is 9588682721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9588682721 = 103 ⋅93094007.

It is a cyclic number.

It is not a de Polignac number, because 1272868859 - 2²⁰ = 1271820283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272868853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7472 + ... + 51005.

It is an arithmetic number, because the mean of its divisors is an integer number (318237276).

Almost surely, 2^1272868859 is an apocalyptic number.

1272868859 is a deficient number, since it is larger than the sum of its proper divisors (80245).

1272868859 is an equidigital number, since it uses as much as digits as its factorization.

1272868859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80244.

The product of its digits is 3870720, while the sum is 56.

The square root of 1272868859 is about 35677.2877192199. The cubic root of 1272868859 is about 1083.7469473149.

The spelling of 1272868859 in words is "one billion, two hundred seventy-two million, eight hundred sixty-eight thousand, eight hundred fifty-nine".