1128897243 has 20 divisors (see below), whose sum is σ = 1687325640. Its totient is φ = 752175072.

The previous prime is 1128897241. The next prime is 1128897251. The reversal of 1128897243 is 3427988211.

It is a happy number.

It is not a de Polignac number, because 1128897243 - 2¹ = 1128897241 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1128897241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 218496 + ... + 223602.

It is an arithmetic number, because the mean of its divisors is an integer number (84366282).

Almost surely, 2^1128897243 is an apocalyptic number.

1128897243 is a deficient number, since it is larger than the sum of its proper divisors (558428397).

1128897243 is an equidigital number, since it uses as much as digits as its factorization.

1128897243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848 (or 7839 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1128897243 is about 33599.0661030928. The cubic root of 1128897243 is about 1041.2415039849.

The spelling of 1128897243 in words is "one billion, one hundred twenty-eight million, eight hundred ninety-seven thousand, two hundred forty-three".