12809420 has 48 divisors (see below), whose sum is σ = 30505440. Its totient is φ = 4478976.

The previous prime is 12809359. The next prime is 12809491. The reversal of 12809420 is 2490821.

12809420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 12809420.

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, 3644 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (635530).

Almost surely, 2^12809420 is an apocalyptic number.

12809420 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 12809420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15252720).

12809420 is an abundant number, since it is smaller than the sum of its proper divisors (17696020).

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

12809420 is a wasteful number, since it uses less digits than its factorization.

12809420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634 (or 2632 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12809420 is about 3579.0250068978. The cubic root of 12809420 is about 233.9787888339.

The spelling of 12809420 in words is "twelve million, eight hundred nine thousand, four hundred twenty".