12805402 has 4 divisors (see below), whose sum is σ = 19208106. Its totient is φ = 6402700.

The previous prime is 12805349. The next prime is 12805417. The reversal of 12805402 is 20450821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20450821 = 19 ⋅1076359.

It can be written as a sum of positive squares in only one way, i.e., 12752041 + 53361 = 3571^2 + 231^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3201349 + ... + 3201352.

Almost surely, 2^12805402 is an apocalyptic number.

12805402 is a deficient number, since it is larger than the sum of its proper divisors (6402704).

12805402 is an equidigital number, since it uses as much as digits as its factorization.

12805402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402703.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 12805402 is about 3578.4636368140. The cubic root of 12805402 is about 233.9543218118.

The spelling of 12805402 in words is "twelve million, eight hundred five thousand, four hundred two".