1158391120 has 20 divisors (see below), whose sum is σ = 2693259540. Its totient is φ = 463356416.

The previous prime is 1158391099. The next prime is 1158391121. The reversal of 1158391120 is 211938511.

It can be written as a sum of positive squares in 2 ways, for example, as 824378944 + 334012176 = 28712^2 + 18276^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158391121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7239865 + ... + 7240024.

It is an arithmetic number, because the mean of its divisors is an integer number (134662977).

Almost surely, 2^1158391120 is an apocalyptic number.

1158391120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1158391120 is an abundant number, since it is smaller than the sum of its proper divisors (1534868420).

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

1158391120 is a wasteful number, since it uses less digits than its factorization.

1158391120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14479902 (or 14479896 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 1158391120 is about 34035.1453647549. The cubic root of 1158391120 is about 1050.2315800620.

It can be divided in two parts, 1158391 and 120, that added together give a palindrome (1158511).

The spelling of 1158391120 in words is "one billion, one hundred fifty-eight million, three hundred ninety-one thousand, one hundred twenty".