1189128540 has 48 divisors (see below), whose sum is σ = 3371719680. Its totient is φ = 313085760.

The previous prime is 1189128503. The next prime is 1189128593. The reversal of 1189128540 is 458219811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120696 + ... + 130175.

It is an arithmetic number, because the mean of its divisors is an integer number (70244160).

Almost surely, 2^1189128540 is an apocalyptic number.

1189128540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1189128540 is an abundant number, since it is smaller than the sum of its proper divisors (2182591140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1189128540 is a wasteful number, since it uses less digits than its factorization.

1189128540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250962 (or 250960 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 1189128540 is about 34483.7431262907. The cubic root of 1189128540 is about 1059.4397597223.

The spelling of 1189128540 in words is "one billion, one hundred eighty-nine million, one hundred twenty-eight thousand, five hundred forty".