12155140 has 48 divisors (see below), whose sum is σ = 26595072. Its totient is φ = 4663296.

The previous prime is 12155137. The next prime is 12155159. The reversal of 12155140 is 4155121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62884 + ... + 63076.

It is an arithmetic number, because the mean of its divisors is an integer number (554064).

Almost surely, 2^12155140 is an apocalyptic number.

12155140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155140 is an abundant number, since it is smaller than the sum of its proper divisors (14439932).

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

12155140 is a wasteful number, since it uses less digits than its factorization.

12155140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 12155140 is about 3486.4222348993. The cubic root of 12155140 is about 229.9252435055.

Subtracting from 12155140 its sum of digits (19), we obtain a palindrome (12155121).

The spelling of 12155140 in words is "twelve million, one hundred fifty-five thousand, one hundred forty".