12155660 has 36 divisors (see below), whose sum is σ = 28064064. Its totient is φ = 4419360.

The previous prime is 12155641. The next prime is 12155677. The reversal of 12155660 is 6655121.

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 11 ways as a sum of consecutive naturals, for example, 92 + ... + 4931.

Almost surely, 2^12155660 is an apocalyptic number.

12155660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12155660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14032032).

12155660 is an abundant number, since it is smaller than the sum of its proper divisors (15908404).

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

12155660 is a wasteful number, since it uses less digits than its factorization.

12155660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054 (or 5041 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 12155660 is about 3486.4968091194. The cubic root of 12155660 is about 229.9285222124.

The spelling of 12155660 in words is "twelve million, one hundred fifty-five thousand, six hundred sixty".