12420005 has 16 divisors (see below), whose sum is σ = 16206960. Its totient is φ = 9082368.

The previous prime is 12419989. The next prime is 12420011. The reversal of 12420005 is 50002421.

It can be written as a sum of positive squares in 8 ways, for example, as 2579236 + 9840769 = 1606^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420005 - 2⁴ = 12419989 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 6209 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (1012935).

Almost surely, 2^12420005 is an apocalyptic number.

It is an amenable number.

12420005 is a deficient number, since it is larger than the sum of its proper divisors (3786955).

12420005 is a wasteful number, since it uses less digits than its factorization.

12420005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 12420005 is about 3524.2027467216. The cubic root of 12420005 is about 231.5833099575.

Adding to 12420005 its reverse (50002421), we get a palindrome (62422426).

The spelling of 12420005 in words is "twelve million, four hundred twenty thousand, five".