420659 has 4 divisors (see below), whose sum is σ = 422304. Its totient is φ = 419016.

The previous prime is 420613. The next prime is 420671. The reversal of 420659 is 956024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420859) 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 in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 980.

It is an arithmetic number, because the mean of its divisors is an integer number (105576).

2⁴²⁰⁶⁵⁹ is an apocalyptic number.

420659 is a deficient number, since it is larger than the sum of its proper divisors (1645).

420659 is a wasteful number, since it uses less digits than its factorization.

420659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 420659 is about 648.5823000977. The cubic root of 420659 is about 74.9278713958.

The spelling of 420659 in words is "four hundred twenty thousand, six hundred fifty-nine".