12420979 has 2 divisors, whose sum is σ = 12420980. Its totient is φ = 12420978.

The previous prime is 12420973. The next prime is 12421007. The reversal of 12420979 is 97902421.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12420979 - 2¹³ = 12412787 is a prime.

It is not a weakly prime, because it can be changed into another prime (12420973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210489 + 6210490.

It is an arithmetic number, because the mean of its divisors is an integer number (6210490).

Almost surely, 2^12420979 is an apocalyptic number.

12420979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420979 is an equidigital number, since it uses as much as digits as its factorization.

12420979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 12420979 is about 3524.3409312948. The cubic root of 12420979 is about 231.5893635312.

The spelling of 12420979 in words is "twelve million, four hundred twenty thousand, nine hundred seventy-nine".