420439 has 2 divisors, whose sum is σ = 420440. Its totient is φ = 420438.

The previous prime is 420421. The next prime is 420457. The reversal of 420439 is 934024.

It is a balanced prime because it is at equal distance from previous prime (420421) and next prime (420457).

It is a cyclic number.

It is not a de Polignac number, because 420439 - 2⁹ = 419927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210219 + 210220.

It is an arithmetic number, because the mean of its divisors is an integer number (210220).

2⁴²⁰⁴³⁹ is an apocalyptic number.

420439 is a deficient number, since it is larger than the sum of its proper divisors (1).

420439 is an equidigital number, since it uses as much as digits as its factorization.

420439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 420439 is about 648.4126772357. The cubic root of 420439 is about 74.9148069690.

The spelling of 420439 in words is "four hundred twenty thousand, four hundred thirty-nine".