12078220 has 144 divisors (see below), whose sum is σ = 34320384. Its totient is φ = 3484800.

The previous prime is 12078217. The next prime is 12078221. The reversal of 12078220 is 2287021.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12078191 and 12078200.

It is not an unprimeable number, because it can be changed into a prime (12078221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 389605 + ... + 389635.

It is an arithmetic number, because the mean of its divisors is an integer number (238336).

Almost surely, 2^12078220 is an apocalyptic number.

12078220 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 12078220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17160192).

12078220 is an abundant number, since it is smaller than the sum of its proper divisors (22242164).

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

12078220 is a wasteful number, since it uses less digits than its factorization.

12078220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 12078220 is about 3475.3733612376. The cubic root of 12078220 is about 229.4392135106.

The spelling of 12078220 in words is "twelve million, seventy-eight thousand, two hundred twenty".