12195905 has 4 divisors (see below), whose sum is σ = 14635092. Its totient is φ = 9756720.

The previous prime is 12195881. The next prime is 12195947. The reversal of 12195905 is 50959121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2660161 + 9535744 = 1631^2 + 3088^2 .

It is not a de Polignac number, because 12195905 - 2¹⁰ = 12194881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219586 + ... + 1219595.

It is an arithmetic number, because the mean of its divisors is an integer number (3658773).

Almost surely, 2^12195905 is an apocalyptic number.

It is an amenable number.

12195905 is a deficient number, since it is larger than the sum of its proper divisors (2439187).

12195905 is an equidigital number, since it uses as much as digits as its factorization.

12195905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439186.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 12195905 is about 3492.2635925714. The cubic root of 12195905 is about 230.1819920630.

The spelling of 12195905 in words is "twelve million, one hundred ninety-five thousand, nine hundred five".