1128239885 has 16 divisors (see below), whose sum is σ = 1423941120. Its totient is φ = 856989120.

The previous prime is 1128239881. The next prime is 1128239887. The reversal of 1128239885 is 5889328211.

It is not a de Polignac number, because 1128239885 - 2² = 1128239881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128239881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60455 + ... + 76884.

It is an arithmetic number, because the mean of its divisors is an integer number (88996320).

Almost surely, 2^1128239885 is an apocalyptic number.

It is an amenable number.

1128239885 is a deficient number, since it is larger than the sum of its proper divisors (295701235).

1128239885 is a wasteful number, since it uses less digits than its factorization.

1128239885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137428.

The product of its digits is 276480, while the sum is 47.

The square root of 1128239885 is about 33589.2822936126. The cubic root of 1128239885 is about 1041.0393594185.

The spelling of 1128239885 in words is "one billion, one hundred twenty-eight million, two hundred thirty-nine thousand, eight hundred eighty-five".