12420505 has 8 divisors (see below), whose sum is σ = 15004224. Its totient is φ = 9870000.

The previous prime is 12420487. The next prime is 12420511. The reversal of 12420505 is 50502421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12420505 - 2¹³ = 12412313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 7471 + ... + 8980.

It is an arithmetic number, because the mean of its divisors is an integer number (1875528).

Almost surely, 2^12420505 is an apocalyptic number.

It is an amenable number.

12420505 is a deficient number, since it is larger than the sum of its proper divisors (2583719).

12420505 is a wasteful number, since it uses less digits than its factorization.

12420505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16607.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 12420505 is about 3524.2736840376. The cubic root of 12420505 is about 231.5864175811.

Adding to 12420505 its reverse (50502421), we get a palindrome (62922926).

The spelling of 12420505 in words is "twelve million, four hundred twenty thousand, five hundred five".