12805533 has 20 divisors (see below), whose sum is σ = 20602428. Its totient is φ = 7879680.

The previous prime is 12805523. The next prime is 12805543. The reversal of 12805533 is 33550821.

12805533 is a `hidden beast` number, since 128 + 0 + 5 + 533 = 666.

It is an interprime number because it is at equal distance from previous prime (12805523) and next prime (12805543).

It can be written as a sum of positive squares in 2 ways, for example, as 2424249 + 10381284 = 1557^2 + 3222^2 .

It is not a de Polignac number, because 12805533 - 2⁴ = 12805517 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12805497 and 12805506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12805523) 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 19 ways as a sum of consecutive naturals, for example, 5028 + ... + 7133.

Almost surely, 2^12805533 is an apocalyptic number.

12805533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12805533 is a deficient number, since it is larger than the sum of its proper divisors (7796895).

12805533 is a wasteful number, since it uses less digits than its factorization.

12805533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12186 (or 12177 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 12805533 is about 3578.4819407117. The cubic root of 12805533 is about 233.9551195978.

The spelling of 12805533 in words is "twelve million, eight hundred five thousand, five hundred thirty-three".