12420385 has 16 divisors (see below), whose sum is σ = 15396480. Its totient is φ = 9614080.

The previous prime is 12420383. The next prime is 12420389. The reversal of 12420385 is 58302421.

It is not a de Polignac number, because 12420385 - 2¹ = 12420383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12420383) 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 15 ways as a sum of consecutive naturals, for example, 20649 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (962280).

Almost surely, 2^12420385 is an apocalyptic number.

It is an amenable number.

12420385 is a deficient number, since it is larger than the sum of its proper divisors (2976095).

12420385 is an equidigital number, since it uses as much as digits as its factorization.

12420385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 12420385 is about 3524.2566592120. The cubic root of 12420385 is about 231.5856717590.

The spelling of 12420385 in words is "twelve million, four hundred twenty thousand, three hundred eighty-five".