12178820 has 12 divisors (see below), whose sum is σ = 25575564. Its totient is φ = 4871520.

The previous prime is 12178819. The next prime is 12178841. The reversal of 12178820 is 2887121.

12178820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7573504 + 4605316 = 2752^2 + 2146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304451 + ... + 304490.

It is an arithmetic number, because the mean of its divisors is an integer number (2131297).

Almost surely, 2^12178820 is an apocalyptic number.

12178820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12178820 is an abundant number, since it is smaller than the sum of its proper divisors (13396744).

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

12178820 is a wasteful number, since it uses less digits than its factorization.

12178820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608950 (or 608948 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12178820 is about 3489.8166140931. The cubic root of 12178820 is about 230.0744560456.

The spelling of 12178820 in words is "twelve million, one hundred seventy-eight thousand, eight hundred twenty".