12420555 has 32 divisors (see below), whose sum is σ = 23500800. Its totient is φ = 5480832.

The previous prime is 12420521. The next prime is 12420571. The reversal of 12420555 is 55502421.

It is a happy number.

It is not a de Polignac number, because 12420555 - 2⁹ = 12420043 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1006 + ... + 5084.

It is an arithmetic number, because the mean of its divisors is an integer number (734400).

Almost surely, 2^12420555 is an apocalyptic number.

12420555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12420555 is a deficient number, since it is larger than the sum of its proper divisors (11080245).

12420555 is a wasteful number, since it uses less digits than its factorization.

12420555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 12420555 is about 3524.2807776907. The cubic root of 12420555 is about 231.5867283389.

Adding to 12420555 its reverse (55502421), we get a palindrome (67922976).

The spelling of 12420555 in words is "twelve million, four hundred twenty thousand, five hundred fifty-five".