12420345 has 64 divisors (see below), whose sum is σ = 24514560. Its totient is φ = 5246208.

The previous prime is 12420341. The next prime is 12420347. The reversal of 12420345 is 54302421.

It is not a de Polignac number, because 12420345 - 2² = 12420341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (12420341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89286 + ... + 89424.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^12420345 is an apocalyptic number.

12420345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12420345 is a deficient number, since it is larger than the sum of its proper divisors (12094215).

12420345 is a wasteful number, since it uses less digits than its factorization.

12420345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 12420345 is about 3524.2509842518. The cubic root of 12420345 is about 231.5854231506.

Adding to 12420345 its reverse (54302421), we get a palindrome (66722766).

It can be divided in two parts, 12420 and 345, that multiplied together give a square (4284900 = 2070²).

The spelling of 12420345 in words is "twelve million, four hundred twenty thousand, three hundred forty-five".