12392820 has 108 divisors (see below), whose sum is σ = 41392260. Its totient is φ = 2999040.

The previous prime is 12392803. The next prime is 12392827. The reversal of 12392820 is 2829321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3175524 + 9217296 = 1782^2 + 3036^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12392827) 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 35 ways as a sum of consecutive naturals, for example, 21496 + ... + 22064.

Almost surely, 2^12392820 is an apocalyptic number.

12392820 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 12392820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20696130).

12392820 is an abundant number, since it is smaller than the sum of its proper divisors (28999440).

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

12392820 is a wasteful number, since it uses less digits than its factorization.

12392820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12392820 is about 3520.3437332170. The cubic root of 12392820 is about 231.4142227697.

The spelling of 12392820 in words is "twelve million, three hundred ninety-two thousand, eight hundred twenty".