1128775387 has 4 divisors (see below), whose sum is σ = 1156306536. Its totient is φ = 1101244240.

The previous prime is 1128775357. The next prime is 1128775409. The reversal of 1128775387 is 7835778211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128775387 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 1128775387.

It is not an unprimeable number, because it can be changed into a prime (1128775337) 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, 13765513 + ... + 13765594.

It is an arithmetic number, because the mean of its divisors is an integer number (289076634).

Almost surely, 2^1128775387 is an apocalyptic number.

1128775387 is a deficient number, since it is larger than the sum of its proper divisors (27531149).

1128775387 is an equidigital number, since it uses as much as digits as its factorization.

1128775387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27531148.

The product of its digits is 658560, while the sum is 49.

The square root of 1128775387 is about 33597.2526704193. The cubic root of 1128775387 is about 1041.2040378969.

The spelling of 1128775387 in words is "one billion, one hundred twenty-eight million, seven hundred seventy-five thousand, three hundred eighty-seven".