12805534 has 16 divisors (see below), whose sum is σ = 22016736. Its totient is φ = 5472000.

The previous prime is 12805523. The next prime is 12805543. The reversal of 12805534 is 43550821.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4474 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (1376046).

Almost surely, 2^12805534 is an apocalyptic number.

12805534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12805534 is a deficient number, since it is larger than the sum of its proper divisors (9211202).

12805534 is a wasteful number, since it uses less digits than its factorization.

12805534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 12805534 is about 3578.4820804358. The cubic root of 12805534 is about 233.9551256877.

The spelling of 12805534 in words is "twelve million, eight hundred five thousand, five hundred thirty-four".