420822439 has 2 divisors, whose sum is σ = 420822440. Its totient is φ = 420822438.

The previous prime is 420822407. The next prime is 420822449. The reversal of 420822439 is 934228024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420822439 - 2⁵ = 420822407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420822449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210411219 + 210411220.

It is an arithmetic number, because the mean of its divisors is an integer number (210411220).

Almost surely, 2^420822439 is an apocalyptic number.

420822439 is a deficient number, since it is larger than the sum of its proper divisors (1).

420822439 is an equidigital number, since it uses as much as digits as its factorization.

420822439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 420822439 is about 20513.9571755427. The cubic root of 420822439 is about 749.3757406927.

It can be divided in two parts, 42082 and 2439, that added together give a square (44521 = 211²).

The spelling of 420822439 in words is "four hundred twenty million, eight hundred twenty-two thousand, four hundred thirty-nine".