420206239 has 2 divisors, whose sum is σ = 420206240. Its totient is φ = 420206238.

The previous prime is 420206233. The next prime is 420206249. The reversal of 420206239 is 932602024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420206239 - 2¹³ = 420198047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420206233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210103119 + 210103120.

It is an arithmetic number, because the mean of its divisors is an integer number (210103120).

Almost surely, 2^420206239 is an apocalyptic number.

420206239 is a deficient number, since it is larger than the sum of its proper divisors (1).

420206239 is an equidigital number, since it uses as much as digits as its factorization.

420206239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 420206239 is about 20498.9326307493. The cubic root of 420206239 is about 749.0097978342.

The spelling of 420206239 in words is "four hundred twenty million, two hundred six thousand, two hundred thirty-nine".