12158819 has 4 divisors (see below), whose sum is σ = 12166080. Its totient is φ = 12151560.

The previous prime is 12158813. The next prime is 12158849. The reversal of 12158819 is 91885121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91885121 = 19 ⋅4836059.

It is a cyclic number.

It is not a de Polignac number, because 12158819 - 2⁸ = 12158563 is a prime.

It is a super-2 number, since 2×12158819² = 295673758949522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12158813) 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, 302 + ... + 4940.

It is an arithmetic number, because the mean of its divisors is an integer number (3041520).

Almost surely, 2^12158819 is an apocalyptic number.

12158819 is a deficient number, since it is larger than the sum of its proper divisors (7261).

12158819 is an equidigital number, since it uses as much as digits as its factorization.

12158819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260.

The product of its digits is 5760, while the sum is 35.

The square root of 12158819 is about 3486.9498132322. The cubic root of 12158819 is about 229.9484383472.

The spelling of 12158819 in words is "twelve million, one hundred fifty-eight thousand, eight hundred nineteen".