12026991 has 4 divisors (see below), whose sum is σ = 16035992. Its totient is φ = 8017992.

The previous prime is 12026983. The next prime is 12027011. The reversal of 12026991 is 19962021.

It is a happy number.

12026991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19962021 = 3 ⋅6654007.

It is not a de Polignac number, because 12026991 - 2³ = 12026983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12026291) 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, 2004496 + ... + 2004501.

It is an arithmetic number, because the mean of its divisors is an integer number (4008998).

Almost surely, 2^12026991 is an apocalyptic number.

12026991 is a deficient number, since it is larger than the sum of its proper divisors (4009001).

12026991 is an equidigital number, since it uses as much as digits as its factorization.

12026991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009000.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 12026991 is about 3467.9952422113. The cubic root of 12026991 is about 229.1143698774.

The spelling of 12026991 in words is "twelve million, twenty-six thousand, nine hundred ninety-one".