12645405 has 24 divisors (see below), whose sum is σ = 22152312. Its totient is φ = 6672384.

The previous prime is 12645403. The next prime is 12645419. The reversal of 12645405 is 50454621.

12645405 is a `hidden beast` number, since 12 + 645 + 4 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 71289 + 12574116 = 267^2 + 3546^2 .

It is not a de Polignac number, because 12645405 - 2¹ = 12645403 is a prime.

It is a super-2 number, since 2×12645405² = 319812535228050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12645401) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2917 + ... + 5813.

It is an arithmetic number, because the mean of its divisors is an integer number (923013).

Almost surely, 2^12645405 is an apocalyptic number.

12645405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12645405 is a deficient number, since it is larger than the sum of its proper divisors (9506907).

12645405 is a wasteful number, since it uses less digits than its factorization.

12645405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005 (or 3002 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 12645405 is about 3556.0378231959. The cubic root of 12645405 is about 232.9758550996.

The spelling of 12645405 in words is "twelve million, six hundred forty-five thousand, four hundred five".