12783820 has 48 divisors (see below), whose sum is σ = 30965760. Its totient is φ = 4342464.

The previous prime is 12783817. The next prime is 12783839. The reversal of 12783820 is 2838721.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17421 + ... + 18139.

It is an arithmetic number, because the mean of its divisors is an integer number (645120).

Almost surely, 2^12783820 is an apocalyptic number.

12783820 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 12783820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15482880).

12783820 is an abundant number, since it is smaller than the sum of its proper divisors (18181940).

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

12783820 is a wasteful number, since it uses less digits than its factorization.

12783820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 12783820 is about 3575.4468252234. The cubic root of 12783820 is about 233.8228137330.

The spelling of 12783820 in words is "twelve million, seven hundred eighty-three thousand, eight hundred twenty".