12420813 has 8 divisors (see below), whose sum is σ = 17432800. Its totient is φ = 7844688.

The previous prime is 12420791. The next prime is 12420823. The reversal of 12420813 is 31802421.

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

It is not a de Polignac number, because 12420813 - 2⁵ = 12420781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12420813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108898 + ... + 109011.

It is an arithmetic number, because the mean of its divisors is an integer number (2179100).

Almost surely, 2^12420813 is an apocalyptic number.

It is an amenable number.

12420813 is a deficient number, since it is larger than the sum of its proper divisors (5011987).

12420813 is a wasteful number, since it uses less digits than its factorization.

12420813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217931.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 12420813 is about 3524.3173807136. The cubic root of 12420813 is about 231.5883318357.

The spelling of 12420813 in words is "twelve million, four hundred twenty thousand, eight hundred thirteen".