1187805087 has 16 divisors (see below), whose sum is σ = 2011098880. Its totient is φ = 678745656.

The previous prime is 1187805071. The next prime is 1187805217. The reversal of 1187805087 is 7805087811.

It is not a de Polignac number, because 1187805087 - 2⁴ = 1187805071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187805067) 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 15 ways as a sum of consecutive naturals, for example, 3142153 + ... + 3142530.

It is an arithmetic number, because the mean of its divisors is an integer number (125693680).

Almost surely, 2^1187805087 is an apocalyptic number.

1187805087 is a deficient number, since it is larger than the sum of its proper divisors (823293793).

1187805087 is an equidigital number, since it uses as much as digits as its factorization.

1187805087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6284699 (or 6284693 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 45.

The square root of 1187805087 is about 34464.5482633967. The cubic root of 1187805087 is about 1059.0465756466.

The spelling of 1187805087 in words is "one billion, one hundred eighty-seven million, eight hundred five thousand, eighty-seven".