12181158 has 32 divisors (see below), whose sum is σ = 29531520. Its totient is φ = 3691080.

The previous prime is 12181157. The next prime is 12181187. The reversal of 12181158 is 85118121.

It is a super-2 number, since 2×12181158² = 296761220441928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9660 + ... + 10847.

It is an arithmetic number, because the mean of its divisors is an integer number (922860).

Almost surely, 2^12181158 is an apocalyptic number.

12181158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12181158 is an abundant number, since it is smaller than the sum of its proper divisors (17350362).

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

12181158 is a wasteful number, since it uses less digits than its factorization.

12181158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20529 (or 20523 counting only the distinct ones).

The product of its digits is 640, while the sum is 27.

The square root of 12181158 is about 3490.1515726398. The cubic root of 12181158 is about 230.0891777690.

12181158 divided by its sum of digits (27) gives a palindrome (451154).

Adding to 12181158 its reverse (85118121), we get a palindrome (97299279).

The spelling of 12181158 in words is "twelve million, one hundred eighty-one thousand, one hundred fifty-eight".