1284890087 has 4 divisors (see below), whose sum is σ = 1383727800. Its totient is φ = 1186052376.

The previous prime is 1284890071. The next prime is 1284890093. The reversal of 1284890087 is 7800984821.

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 1284890087 - 2⁴ = 1284890071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284890287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49418837 + ... + 49418862.

It is an arithmetic number, because the mean of its divisors is an integer number (345931950).

Almost surely, 2^1284890087 is an apocalyptic number.

1284890087 is a deficient number, since it is larger than the sum of its proper divisors (98837713).

1284890087 is an equidigital number, since it uses as much as digits as its factorization.

1284890087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98837712.

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 1284890087 is about 35845.3635356095. The cubic root of 1284890087 is about 1087.1479706492.

The spelling of 1284890087 in words is "one billion, two hundred eighty-four million, eight hundred ninety thousand, eighty-seven".