12155860 has 24 divisors (see below), whose sum is σ = 25635456. Its totient is φ = 4841760.

The previous prime is 12155851. The next prime is 12155863. The reversal of 12155860 is 6855121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4105 + ... + 6415.

It is an arithmetic number, because the mean of its divisors is an integer number (1068144).

Almost surely, 2^12155860 is an apocalyptic number.

12155860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155860 is an abundant number, since it is smaller than the sum of its proper divisors (13479596).

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

12155860 is a wasteful number, since it uses less digits than its factorization.

12155860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583 (or 2581 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 12155860 is about 3486.5254910871. The cubic root of 12155860 is about 229.9297832286.

The spelling of 12155860 in words is "twelve million, one hundred fifty-five thousand, eight hundred sixty".