1165985128 has 32 divisors (see below), whose sum is σ = 2725680960. Its totient is φ = 454279680.

The previous prime is 1165985123. The next prime is 1165985131. The reversal of 1165985128 is 8215895611.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1165985123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945801 + ... + 947032.

It is an arithmetic number, because the mean of its divisors is an integer number (85177530).

Almost surely, 2^1165985128 is an apocalyptic number.

It is an amenable number.

1165985128 is an abundant number, since it is smaller than the sum of its proper divisors (1559695832).

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

1165985128 is a wasteful number, since it uses less digits than its factorization.

1165985128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892857 (or 1892853 counting only the distinct ones).

The product of its digits is 172800, while the sum is 46.

The square root of 1165985128 is about 34146.5243912173. The cubic root of 1165985128 is about 1052.5215671412.

The spelling of 1165985128 in words is "one billion, one hundred sixty-five million, nine hundred eighty-five thousand, one hundred twenty-eight".