12271945 has 16 divisors (see below), whose sum is σ = 16887168. Its totient is φ = 8386560.

The previous prime is 12271879. The next prime is 12271951. The reversal of 12271945 is 54917221.

It is not a de Polignac number, because 12271945 - 2¹³ = 12263753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18825 + ... + 19465.

It is an arithmetic number, because the mean of its divisors is an integer number (1055448).

Almost surely, 2^12271945 is an apocalyptic number.

It is an amenable number.

12271945 is a deficient number, since it is larger than the sum of its proper divisors (4615223).

12271945 is an equidigital number, since it uses as much as digits as its factorization.

12271945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200.

The product of its digits is 5040, while the sum is 31.

The square root of 12271945 is about 3503.1335972241. The cubic root of 12271945 is about 230.6593869403.

The spelling of 12271945 in words is "twelve million, two hundred seventy-one thousand, nine hundred forty-five".