12081906 has 32 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 3917808.

The previous prime is 12081899. The next prime is 12081913. The reversal of 12081906 is 60918021.

It is an interprime number because it is at equal distance from previous prime (12081899) and next prime (12081913).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12081906.

It is a congruent 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, 1026 + ... + 5021.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^12081906 is an apocalyptic number.

12081906 is an abundant number, since it is smaller than the sum of its proper divisors (15496974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12081906 is a wasteful number, since it uses less digits than its factorization.

12081906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6095 (or 6089 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 12081906 is about 3475.9036235201. The cubic root of 12081906 is about 229.4625510257.

Adding to 12081906 its reverse (60918021), we get a palindrome (72999927).

The spelling of 12081906 in words is "twelve million, eighty-one thousand, nine hundred six".