12081905 has 16 divisors (see below), whose sum is σ = 15971904. Its totient is φ = 8700480.

The previous prime is 12081899. The next prime is 12081913. The reversal of 12081905 is 50918021.

It is a happy number.

It is not a de Polignac number, because 12081905 - 2⁴ = 12081889 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4859 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (998244).

Almost surely, 2^12081905 is an apocalyptic number.

It is an amenable number.

12081905 is a deficient number, since it is larger than the sum of its proper divisors (3889999).

12081905 is a wasteful number, since it uses less digits than its factorization.

12081905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 12081905 is about 3475.9034796726. The cubic root of 12081905 is about 229.4625446949.

Adding to 12081905 its reverse (50918021), we get a palindrome (62999926).

It can be divided in two parts, 1208 and 1905, that added together give a palindrome (3113).

The spelling of 12081905 in words is "twelve million, eighty-one thousand, nine hundred five".