1165987590 has 16 divisors (see below), whose sum is σ = 2798370288. Its totient is φ = 310930016.

The previous prime is 1165987583. The next prime is 1165987591. The reversal of 1165987590 is 957895611.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165987591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19433097 + ... + 19433156.

It is an arithmetic number, because the mean of its divisors is an integer number (174898143).

Almost surely, 2^1165987590 is an apocalyptic number.

1165987590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1165987590 is an abundant number, since it is smaller than the sum of its proper divisors (1632382698).

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

1165987590 is a wasteful number, since it uses less digits than its factorization.

1165987590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38866263.

The product of its (nonzero) digits is 680400, while the sum is 51.

The square root of 1165987590 is about 34146.5604417195. The cubic root of 1165987590 is about 1052.5223079472.

The spelling of 1165987590 in words is "one billion, one hundred sixty-five million, nine hundred eighty-seven thousand, five hundred ninety".