12815780 has 24 divisors (see below), whose sum is σ = 27571320. Its totient is φ = 5000960.

The previous prime is 12815743. The next prime is 12815783. The reversal of 12815780 is 8751821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2096704 + 10719076 = 1448^2 + 3274^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6995 + ... + 8634.

It is an arithmetic number, because the mean of its divisors is an integer number (1148805).

Almost surely, 2^12815780 is an apocalyptic number.

12815780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12815780 is an abundant number, since it is smaller than the sum of its proper divisors (14755540).

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

12815780 is a wasteful number, since it uses less digits than its factorization.

12815780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15679 (or 15677 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 12815780 is about 3579.9134067740. The cubic root of 12815780 is about 234.0175066650.

The spelling of 12815780 in words is "twelve million, eight hundred fifteen thousand, seven hundred eighty".