12138660 has 120 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 3157056.

The previous prime is 12138649. The next prime is 12138661. The reversal of 12138660 is 6683121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12138661) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 95517 + ... + 95643.

It is an arithmetic number, because the mean of its divisors is an integer number (325248).

Almost surely, 2^12138660 is an apocalyptic number.

12138660 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 12138660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19514880).

12138660 is an abundant number, since it is smaller than the sum of its proper divisors (26891100).

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

12138660 is a wasteful number, since it uses less digits than its factorization.

12138660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12138660 is about 3484.0579788517. The cubic root of 12138660 is about 229.8212852415.

It can be divided in two parts, 121 and 38660, that added together give a triangular number (38781 = T₂₇₈).

The spelling of 12138660 in words is "twelve million, one hundred thirty-eight thousand, six hundred sixty".