1284671887 has 4 divisors (see below), whose sum is σ = 1285979760. Its totient is φ = 1283364016.

The previous prime is 1284671881. The next prime is 1284671933. The reversal of 1284671887 is 7881764821.

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

It is a cyclic number.

It is not a de Polignac number, because 1284671887 - 2¹¹ = 1284669839 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 (1284671881) 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, 652462 + ... + 654427.

It is an arithmetic number, because the mean of its divisors is an integer number (321494940).

Almost surely, 2^1284671887 is an apocalyptic number.

1284671887 is a deficient number, since it is larger than the sum of its proper divisors (1307873).

1284671887 is an equidigital number, since it uses as much as digits as its factorization.

1284671887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307872.

The product of its digits is 1204224, while the sum is 52.

The square root of 1284671887 is about 35842.3197770457. The cubic root of 1284671887 is about 1087.0864273523.

The spelling of 1284671887 in words is "one billion, two hundred eighty-four million, six hundred seventy-one thousand, eight hundred eighty-seven".