1286995879 has 4 divisors (see below), whose sum is σ = 1385995576. Its totient is φ = 1187996184.

The previous prime is 1286995867. The next prime is 1286995909. The reversal of 1286995879 is 9785996821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9785996821 = 2383 ⋅4106587.

It is a cyclic number.

It is not a de Polignac number, because 1286995879 - 2⁵ = 1286995847 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 1286995879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286995819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49499829 + ... + 49499854.

It is an arithmetic number, because the mean of its divisors is an integer number (346498894).

Almost surely, 2^1286995879 is an apocalyptic number.

1286995879 is a deficient number, since it is larger than the sum of its proper divisors (98999697).

1286995879 is an equidigital number, since it uses as much as digits as its factorization.

1286995879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98999696.

The product of its digits is 19595520, while the sum is 64.

The square root of 1286995879 is about 35874.7247933695. The cubic root of 1286995879 is about 1087.7415513816.

The spelling of 1286995879 in words is "one billion, two hundred eighty-six million, nine hundred ninety-five thousand, eight hundred seventy-nine".