1128742789 has 4 divisors (see below), whose sum is σ = 1131061024. Its totient is φ = 1126424556.

The previous prime is 1128742787. The next prime is 1128742793. The reversal of 1128742789 is 9872478211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1128742789 - 2¹ = 1128742787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128742781) 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, 1158387 + ... + 1159360.

It is an arithmetic number, because the mean of its divisors is an integer number (282765256).

Almost surely, 2^1128742789 is an apocalyptic number.

It is an amenable number.

1128742789 is a deficient number, since it is larger than the sum of its proper divisors (2318235).

1128742789 is an equidigital number, since it uses as much as digits as its factorization.

1128742789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318234.

The product of its digits is 451584, while the sum is 49.

The square root of 1128742789 is about 33596.7675379641. The cubic root of 1128742789 is about 1041.1940147939.

The spelling of 1128742789 in words is "one billion, one hundred twenty-eight million, seven hundred forty-two thousand, seven hundred eighty-nine".