12161808 has 30 divisors (see below), whose sum is σ = 34036574. Its totient is φ = 4053888.

The previous prime is 12161801. The next prime is 12161833. The reversal of 12161808 is 80816121.

It can be written as a sum of positive squares in only one way, i.e., 10969344 + 1192464 = 3312^2 + 1092^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12161801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42085 + ... + 42372.

Almost surely, 2^12161808 is an apocalyptic number.

12161808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12161808 is an abundant number, since it is smaller than the sum of its proper divisors (21874766).

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

12161808 is a wasteful number, since it uses less digits than its factorization.

12161808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84471 (or 84462 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 12161808 is about 3487.3783849763. The cubic root of 12161808 is about 229.9672795293.

Adding to 12161808 its reverse (80816121), we get a palindrome (92977929).

The spelling of 12161808 in words is "twelve million, one hundred sixty-one thousand, eight hundred eight".