12205997 has 4 divisors (see below), whose sum is σ = 12213276. Its totient is φ = 12198720.

The previous prime is 12205981. The next prime is 12206021. The reversal of 12205997 is 79950221.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 5621641 + 6584356 = 2371^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 12205997 - 2⁴ = 12205981 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 (12205957) 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, 293 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (3053319).

Almost surely, 2^12205997 is an apocalyptic number.

It is an amenable number.

12205997 is a deficient number, since it is larger than the sum of its proper divisors (7279).

12205997 is an equidigital number, since it uses as much as digits as its factorization.

12205997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 12205997 is about 3493.7082018967. The cubic root of 12205997 is about 230.2454657237.

The spelling of 12205997 in words is "twelve million, two hundred five thousand, nine hundred ninety-seven".