12420019 has 2 divisors, whose sum is σ = 12420020. Its totient is φ = 12420018.

The previous prime is 12420017. The next prime is 12420029. The reversal of 12420019 is 91002421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12420019 - 2¹ = 12420017 is a prime.

It is a super-2 number, since 2×12420019² = 308513743920722, which contains 22 as substring.

Together with 12420017, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12419978 and 12420005.

It is not a weakly prime, because it can be changed into another prime (12420011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210009 + 6210010.

It is an arithmetic number, because the mean of its divisors is an integer number (6210010).

Almost surely, 2^12420019 is an apocalyptic number.

12420019 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420019 is an equidigital number, since it uses as much as digits as its factorization.

12420019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12420019 is about 3524.2047329859. The cubic root of 12420019 is about 231.5833969721.

The spelling of 12420019 in words is "twelve million, four hundred twenty thousand, nineteen".