12291908 has 6 divisors (see below), whose sum is σ = 21510846. Its totient is φ = 6145952.

The previous prime is 12291899. The next prime is 12291941. The reversal of 12291908 is 80919221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10125124 + 2166784 = 3182^2 + 1472^2 .

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 as a sum of consecutive naturals, namely, 1536485 + ... + 1536492.

It is an arithmetic number, because the mean of its divisors is an integer number (3585141).

Almost surely, 2^12291908 is an apocalyptic number.

It is an amenable number.

12291908 is a deficient number, since it is larger than the sum of its proper divisors (9218938).

12291908 is a wasteful number, since it uses less digits than its factorization.

12291908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072981 (or 3072979 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12291908 is about 3505.9817455315. The cubic root of 12291908 is about 230.7843918130.

The spelling of 12291908 in words is "twelve million, two hundred ninety-one thousand, nine hundred eight".