8420685 has 64 divisors (see below), whose sum is σ = 17203200. Its totient is φ = 3421440.

The previous prime is 8420681. The next prime is 8420749. The reversal of 8420685 is 5860248.

It is not a de Polignac number, because 8420685 - 2² = 8420681 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420681) 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 63 ways as a sum of consecutive naturals, for example, 42216 + ... + 42414.

It is an arithmetic number, because the mean of its divisors is an integer number (268800).

Almost surely, 2^8420685 is an apocalyptic number.

It is an amenable number.

8420685 is an abundant number, since it is smaller than the sum of its proper divisors (8782515).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8420685 is a wasteful number, since it uses less digits than its factorization.

8420685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 8420685 is about 2901.8416566036. The cubic root of 8420685 is about 203.4459929890.

The spelling of 8420685 in words is "eight million, four hundred twenty thousand, six hundred eighty-five".