420859 has 2 divisors, whose sum is σ = 420860. Its totient is φ = 420858.

The previous prime is 420857. The next prime is 420899. The reversal of 420859 is 958024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420859 - 2¹ = 420857 is a prime.

Together with 420857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210429 + 210430.

It is an arithmetic number, because the mean of its divisors is an integer number (210430).

2⁴²⁰⁸⁵⁹ is an apocalyptic number.

420859 is a deficient number, since it is larger than the sum of its proper divisors (1).

420859 is an equidigital number, since it uses as much as digits as its factorization.

420859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 420859 is about 648.7364642133. The cubic root of 420859 is about 74.9397441954.

It can be divided in two parts, 4 and 20859, that multiplied together give a triangular number (83436 = T₄₀₈).

The spelling of 420859 in words is "four hundred twenty thousand, eight hundred fifty-nine".