12209947 has 2 divisors, whose sum is σ = 12209948. Its totient is φ = 12209946.

The previous prime is 12209933. The next prime is 12209959. The reversal of 12209947 is 74990221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12209947 - 2⁷ = 12209819 is a prime.

It is not a weakly prime, because it can be changed into another prime (12209147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104973 + 6104974.

It is an arithmetic number, because the mean of its divisors is an integer number (6104974).

Almost surely, 2^12209947 is an apocalyptic number.

12209947 is a deficient number, since it is larger than the sum of its proper divisors (1).

12209947 is an equidigital number, since it uses as much as digits as its factorization.

12209947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 12209947 is about 3494.2734581026. The cubic root of 12209947 is about 230.2702997323.

The spelling of 12209947 in words is "twelve million, two hundred nine thousand, nine hundred forty-seven".