1286800987 has 4 divisors (see below), whose sum is σ = 1342748880. Its totient is φ = 1230853096.

The previous prime is 1286800967. The next prime is 1286800993. The reversal of 1286800987 is 7890086821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890086821 = 83 ⋅95061287.

It is a de Polignac number, because none of the positive numbers 2^k-1286800987 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 1286800987.

It is not an unprimeable number, because it can be changed into a prime (1286800937) 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, 27973912 + ... + 27973957.

It is an arithmetic number, because the mean of its divisors is an integer number (335687220).

Almost surely, 2^1286800987 is an apocalyptic number.

1286800987 is a deficient number, since it is larger than the sum of its proper divisors (55947893).

1286800987 is an equidigital number, since it uses as much as digits as its factorization.

1286800987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55947892.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 1286800987 is about 35872.0084048830. The cubic root of 1286800987 is about 1087.6866424184.

The spelling of 1286800987 in words is "one billion, two hundred eighty-six million, eight hundred thousand, nine hundred eighty-seven".