12420518 has 16 divisors (see below), whose sum is σ = 20395584. Its totient is φ = 5625960.

The previous prime is 12420517. The next prime is 12420521. The reversal of 12420518 is 81502421.

It is a junction number, because it is equal to n+sod(n) for n = 12420493 and 12420502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420511) 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 7 ways as a sum of consecutive naturals, for example, 6821 + ... + 8447.

It is an arithmetic number, because the mean of its divisors is an integer number (1274724).

Almost surely, 2^12420518 is an apocalyptic number.

12420518 is a deficient number, since it is larger than the sum of its proper divisors (7975066).

12420518 is a wasteful number, since it uses less digits than its factorization.

12420518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12420518 is about 3524.2755283888. The cubic root of 12420518 is about 231.5864983782.

Adding to 12420518 its reverse (81502421), we get a palindrome (93922939).

The spelling of 12420518 in words is "twelve million, four hundred twenty thousand, five hundred eighteen".