1158115778 has 8 divisors (see below), whose sum is σ = 1828603920. Its totient is φ = 548581140.

The previous prime is 1158115771. The next prime is 1158115789. The reversal of 1158115778 is 8775118511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1158115771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15238328 + ... + 15238403.

It is an arithmetic number, because the mean of its divisors is an integer number (228575490).

Almost surely, 2^1158115778 is an apocalyptic number.

1158115778 is a deficient number, since it is larger than the sum of its proper divisors (670488142).

1158115778 is a wasteful number, since it uses less digits than its factorization.

1158115778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30476752.

The product of its digits is 78400, while the sum is 44.

The square root of 1158115778 is about 34031.1001585315. The cubic root of 1158115778 is about 1050.1483624069.

The spelling of 1158115778 in words is "one billion, one hundred fifty-eight million, one hundred fifteen thousand, seven hundred seventy-eight".