12420838 has 4 divisors (see below), whose sum is σ = 18631260. Its totient is φ = 6210418.

The previous prime is 12420833. The next prime is 12420839. The reversal of 12420838 is 83802421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83802421 = 197 ⋅425393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3105208 + ... + 3105211.

It is an arithmetic number, because the mean of its divisors is an integer number (4657815).

Almost surely, 2^12420838 is an apocalyptic number.

12420838 is a deficient number, since it is larger than the sum of its proper divisors (6210422).

12420838 is an equidigital number, since it uses as much as digits as its factorization.

12420838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210421.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 12420838 is about 3524.3209274979. The cubic root of 12420838 is about 231.5884872121.

The spelling of 12420838 in words is "twelve million, four hundred twenty thousand, eight hundred thirty-eight".