12155240 has 64 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 4596480.

The previous prime is 12155237. The next prime is 12155257. The reversal of 12155240 is 4255121.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 63545 + ... + 63735.

It is an arithmetic number, because the mean of its divisors is an integer number (451440).

Almost surely, 2^12155240 is an apocalyptic number.

12155240 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 12155240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14446080).

12155240 is an abundant number, since it is smaller than the sum of its proper divisors (16736920).

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

12155240 is a wasteful number, since it uses less digits than its factorization.

12155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 12155240 is about 3486.4365762193. The cubic root of 12155240 is about 229.9258740333.

The spelling of 12155240 in words is "twelve million, one hundred fifty-five thousand, two hundred forty".