12821775 has 12 divisors (see below), whose sum is σ = 21198792. Its totient is φ = 6838240.

The previous prime is 12821761. The next prime is 12821801. The reversal of 12821775 is 57712821.

12821775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12821775 - 2¹⁹ = 12297487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85404 + ... + 85553.

It is an arithmetic number, because the mean of its divisors is an integer number (1766566).

Almost surely, 2^12821775 is an apocalyptic number.

12821775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12821775 is a deficient number, since it is larger than the sum of its proper divisors (8377017).

12821775 is a wasteful number, since it uses less digits than its factorization.

12821775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170970 (or 170965 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 12821775 is about 3580.7506196327. The cubic root of 12821775 is about 234.0539907560.

The spelling of 12821775 in words is "twelve million, eight hundred twenty-one thousand, seven hundred seventy-five".