420220079 has 2 divisors, whose sum is σ = 420220080. Its totient is φ = 420220078.

The previous prime is 420220061. The next prime is 420220139. The reversal of 420220079 is 970022024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420220079 is a prime.

It is equal to p_22355540 and since 420220079 and 22355540 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420220049) by changing a digit.

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 as a sum of consecutive naturals, namely, 210110039 + 210110040.

It is an arithmetic number, because the mean of its divisors is an integer number (210110040).

Almost surely, 2^420220079 is an apocalyptic number.

420220079 is a deficient number, since it is larger than the sum of its proper divisors (1).

420220079 is an equidigital number, since it uses as much as digits as its factorization.

420220079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 420220079 is about 20499.2702065220. The cubic root of 420220079 is about 749.0180209247.

The spelling of 420220079 in words is "four hundred twenty million, two hundred twenty thousand, seventy-nine".