12173147 has 4 divisors (see below), whose sum is σ = 13912176. Its totient is φ = 10434120.

The previous prime is 12173143. The next prime is 12173159. The reversal of 12173147 is 74137121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12173147 - 2² = 12173143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12173143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869504 + ... + 869517.

It is an arithmetic number, because the mean of its divisors is an integer number (3478044).

Almost surely, 2^12173147 is an apocalyptic number.

12173147 is a deficient number, since it is larger than the sum of its proper divisors (1739029).

12173147 is an equidigital number, since it uses as much as digits as its factorization.

12173147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739028.

The product of its digits is 1176, while the sum is 26.

The square root of 12173147 is about 3489.0037259940. The cubic root of 12173147 is about 230.0387269382.

Subtracting from 12173147 its sum of digits (26), we obtain a square (12173121 = 3489²).

The spelling of 12173147 in words is "twelve million, one hundred seventy-three thousand, one hundred forty-seven".