1287812847 has 4 divisors (see below), whose sum is σ = 1717083800. Its totient is φ = 858541896.

The previous prime is 1287812809. The next prime is 1287812879. The reversal of 1287812847 is 7482187821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1287812847 - 2²² = 1283618543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1287812796 and 1287812805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287822847) 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, 214635472 + ... + 214635477.

It is an arithmetic number, because the mean of its divisors is an integer number (429270950).

Almost surely, 2^1287812847 is an apocalyptic number.

1287812847 is a deficient number, since it is larger than the sum of its proper divisors (429270953).

1287812847 is an equidigital number, since it uses as much as digits as its factorization.

1287812847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429270952.

The product of its digits is 401408, while the sum is 48.

The square root of 1287812847 is about 35886.1093878955. The cubic root of 1287812847 is about 1087.9716640251.

The spelling of 1287812847 in words is "one billion, two hundred eighty-seven million, eight hundred twelve thousand, eight hundred forty-seven".