420085 has 4 divisors (see below), whose sum is σ = 504108. Its totient is φ = 336064.

The previous prime is 420073. The next prime is 420097. The reversal of 420085 is 580024.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (420073) and next prime (420097).

It can be written as a sum of positive squares in 2 ways, for example, as 98596 + 321489 = 314^2 + 567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420085 is a prime.

It is a Duffinian number.

420085 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 42004 + ... + 42013.

It is an arithmetic number, because the mean of its divisors is an integer number (126027).

2⁴²⁰⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

420085 is a deficient number, since it is larger than the sum of its proper divisors (84023).

420085 is an equidigital number, since it uses as much as digits as its factorization.

420085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84022.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 420085 is about 648.1396454469. The cubic root of 420085 is about 74.8937755485.

The spelling of 420085 in words is "four hundred twenty thousand, eighty-five".