12001158 has 24 divisors (see below), whose sum is σ = 28003248. Its totient is φ = 3692592.

The previous prime is 12001153. The next prime is 12001159. The reversal of 12001158 is 85110021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 12001158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25410 + ... + 25877.

It is an arithmetic number, because the mean of its divisors is an integer number (1166802).

Almost surely, 2^12001158 is an apocalyptic number.

12001158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12001158 is an abundant number, since it is smaller than the sum of its proper divisors (16002090).

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

12001158 is a wasteful number, since it uses less digits than its factorization.

12001158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51308 (or 51305 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 12001158 is about 3464.2687540086. The cubic root of 12001158 is about 228.9502126021.

Adding to 12001158 its reverse (85110021), we get a palindrome (97111179).

The spelling of 12001158 in words is "twelve million, one thousand, one hundred fifty-eight".