1128042987 has 4 divisors (see below), whose sum is σ = 1504057320. Its totient is φ = 752028656.

The previous prime is 1128042983. The next prime is 1128042997. The reversal of 1128042987 is 7892408211.

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 1128042987 - 2² = 1128042983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128042983) 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, 188007162 + ... + 188007167.

It is an arithmetic number, because the mean of its divisors is an integer number (376014330).

Almost surely, 2^1128042987 is an apocalyptic number.

1128042987 is a deficient number, since it is larger than the sum of its proper divisors (376014333).

1128042987 is an equidigital number, since it uses as much as digits as its factorization.

1128042987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376014332.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1128042987 is about 33586.3512010459. The cubic root of 1128042987 is about 1040.9787959113.

The spelling of 1128042987 in words is "one billion, one hundred twenty-eight million, forty-two thousand, nine hundred eighty-seven".