12155808 has 48 divisors (see below), whose sum is σ = 36469440. Its totient is φ = 3472896.

The previous prime is 12155807. The next prime is 12155821. The reversal of 12155808 is 80855121.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (12155807) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8373 + ... + 9716.

It is an arithmetic number, because the mean of its divisors is an integer number (759780).

Almost surely, 2^12155808 is an apocalyptic number.

It is an amenable number.

12155808 is an abundant number, since it is smaller than the sum of its proper divisors (24313632).

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

12155808 is a wasteful number, since it uses less digits than its factorization.

12155808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18109 (or 18101 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 12155808 is about 3486.5180337982. The cubic root of 12155808 is about 229.9294553657.

The spelling of 12155808 in words is "twelve million, one hundred fifty-five thousand, eight hundred eight".