12420340 has 12 divisors (see below), whose sum is σ = 26082756. Its totient is φ = 4968128.

The previous prime is 12420337. The next prime is 12420341. The reversal of 12420340 is 4302421.

It can be written as a sum of positive squares in 2 ways, for example, as 4613904 + 7806436 = 2148^2 + 2794^2 .

It is a congruent number.

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

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 3 ways as a sum of consecutive naturals, for example, 310489 + ... + 310528.

It is an arithmetic number, because the mean of its divisors is an integer number (2173563).

Almost surely, 2^12420340 is an apocalyptic number.

12420340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12420340 is an abundant number, since it is smaller than the sum of its proper divisors (13662416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12420340 is a wasteful number, since it uses less digits than its factorization.

12420340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621026 (or 621024 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12420340 is about 3524.2502748812. The cubic root of 12420340 is about 231.5853920745.

Adding to 12420340 its reverse (4302421), we get a palindrome (16722761).

The spelling of 12420340 in words is "twelve million, four hundred twenty thousand, three hundred forty".