12181897 has 16 divisors (see below), whose sum is σ = 15079680. Its totient is φ = 9582912.

The previous prime is 12181867. The next prime is 12181909. The reversal of 12181897 is 79818121.

12181897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12181897 - 2¹⁹ = 11657609 is a prime.

It is a super-2 number, since 2×12181897² = 296797229037218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12181817) 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, 23679 + ... + 24187.

It is an arithmetic number, because the mean of its divisors is an integer number (942480).

Almost surely, 2^12181897 is an apocalyptic number.

It is an amenable number.

12181897 is a deficient number, since it is larger than the sum of its proper divisors (2897783).

12181897 is a wasteful number, since it uses less digits than its factorization.

12181897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 8064, while the sum is 37.

The square root of 12181897 is about 3490.2574403617. The cubic root of 12181897 is about 230.0938306508.

The spelling of 12181897 in words is "twelve million, one hundred eighty-one thousand, eight hundred ninety-seven".