420785 has 8 divisors (see below), whose sum is σ = 527040. Its totient is φ = 321904.

The previous prime is 420781. The next prime is 420799. The reversal of 420785 is 587024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420785 - 2² = 420781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420781) 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 7 ways as a sum of consecutive naturals, for example, 1715 + ... + 1944.

It is an arithmetic number, because the mean of its divisors is an integer number (65880).

2⁴²⁰⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

420785 is a deficient number, since it is larger than the sum of its proper divisors (106255).

420785 is a wasteful number, since it uses less digits than its factorization.

420785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 420785 is about 648.6794277607. The cubic root of 420785 is about 74.9353516980.

The spelling of 420785 in words is "four hundred twenty thousand, seven hundred eighty-five".