420186 has 16 divisors (see below), whose sum is σ = 905184. Its totient is φ = 129264.

The previous prime is 420163. The next prime is 420191. The reversal of 420186 is 681024.

It is an unprimeable number.

420186 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2616 + ... + 2771.

It is an arithmetic number, because the mean of its divisors is an integer number (56574).

2⁴²⁰¹⁸⁶ is an apocalyptic number.

420186 is an abundant number, since it is smaller than the sum of its proper divisors (484998).

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

420186 is a wasteful number, since it uses less digits than its factorization.

420186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 420186 is about 648.2175560720. The cubic root of 420186 is about 74.8997772428.

It can be divided in two parts, 42018 and 6, that added together give a palindrome (42024).

The spelling of 420186 in words is "four hundred twenty thousand, one hundred eighty-six".