421670 has 16 divisors (see below), whose sum is σ = 766800. Its totient is φ = 166944.

The previous prime is 421661. The next prime is 421691. The reversal of 421670 is 76124.

421670 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

421670 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 1349 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (47925).

2⁴²¹⁶⁷⁰ is an apocalyptic number.

421670 is a deficient number, since it is larger than the sum of its proper divisors (345130).

421670 is a wasteful number, since it uses less digits than its factorization.

421670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 421670 is about 649.3612245892. The cubic root of 421670 is about 74.9878498836.

Adding to 421670 its reverse (76124), we get a palindrome (497794).

The spelling of 421670 in words is "four hundred twenty-one thousand, six hundred seventy".