12178540 has 48 divisors (see below), whose sum is σ = 28141344. Its totient is φ = 4390400.

The previous prime is 12178501. The next prime is 12178541. The reversal of 12178540 is 4587121.

It is a junction number, because it is equal to n+sod(n) for n = 12178499 and 12178508.

It is not an unprimeable number, because it can be changed into a prime (12178541) by changing a digit.

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, 43200 + ... + 43480.

It is an arithmetic number, because the mean of its divisors is an integer number (586278).

Almost surely, 2^12178540 is an apocalyptic number.

12178540 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 12178540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14070672).

12178540 is an abundant number, since it is smaller than the sum of its proper divisors (15962804).

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

12178540 is a wasteful number, since it uses less digits than its factorization.

12178540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 12178540 is about 3489.7764971413. The cubic root of 12178540 is about 230.0726928386.

The spelling of 12178540 in words is "twelve million, one hundred seventy-eight thousand, five hundred forty".