12798405 has 20 divisors (see below), whose sum is σ = 22943052. Its totient is φ = 6825600.

The previous prime is 12798397. The next prime is 12798413. The reversal of 12798405 is 50489721.

It is an interprime number because it is at equal distance from previous prime (12798397) and next prime (12798413).

It can be written as a sum of positive squares in 2 ways, for example, as 8661249 + 4137156 = 2943^2 + 2034^2 .

It is not a de Polignac number, because 12798405 - 2³ = 12798397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12798405.

It is a congruent 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 in 19 ways as a sum of consecutive naturals, for example, 15396 + ... + 16205.

Almost surely, 2^12798405 is an apocalyptic number.

12798405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12798405 is a deficient number, since it is larger than the sum of its proper divisors (10144647).

12798405 is an equidigital number, since it uses as much as digits as its factorization.

12798405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31618 (or 31609 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 12798405 is about 3577.4858490286. The cubic root of 12798405 is about 233.9117023861.

It can be divided in two parts, 12798 and 405, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12798405 in words is "twelve million, seven hundred ninety-eight thousand, four hundred five".