1155979158 has 32 divisors (see below), whose sum is σ = 2488099680. Its totient is φ = 356712960.

The previous prime is 1155979129. The next prime is 1155979159. The reversal of 1155979158 is 8519795511.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 1155979158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155979159) 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 15 ways as a sum of consecutive naturals, for example, 86673 + ... + 99116.

It is an arithmetic number, because the mean of its divisors is an integer number (77753115).

Almost surely, 2^1155979158 is an apocalyptic number.

1155979158 is an abundant number, since it is smaller than the sum of its proper divisors (1332120522).

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

1155979158 is a wasteful number, since it uses less digits than its factorization.

1155979158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185872.

The product of its digits is 567000, while the sum is 51.

The square root of 1155979158 is about 33999.6934986185. The cubic root of 1155979158 is about 1049.5021549197.

The spelling of 1155979158 in words is "one billion, one hundred fifty-five million, nine hundred seventy-nine thousand, one hundred fifty-eight".