1158781992 has 32 divisors (see below), whose sum is σ = 2958595200. Its totient is φ = 378041984.

The previous prime is 1158781991. The next prime is 1158781993. The reversal of 1158781992 is 2991878511.

It is an interprime number because it is at equal distance from previous prime (1158781991) and next prime (1158781993).

It is not an unprimeable number, because it can be changed into a prime (1158781991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512517 + ... + 514772.

It is an arithmetic number, because the mean of its divisors is an integer number (92456100).

Almost surely, 2^1158781992 is an apocalyptic number.

1158781992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1158781992 is an abundant number, since it is smaller than the sum of its proper divisors (1799813208).

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

1158781992 is a wasteful number, since it uses less digits than its factorization.

1158781992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027345 (or 1027341 counting only the distinct ones).

The product of its digits is 362880, while the sum is 51.

The square root of 1158781992 is about 34040.8870624724. The cubic root of 1158781992 is about 1050.3496921423.

The spelling of 1158781992 in words is "one billion, one hundred fifty-eight million, seven hundred eighty-one thousand, nine hundred ninety-two".