421590 has 64 divisors (see below), whose sum is σ = 1161216. Its totient is φ = 97152.

The previous prime is 421559. The next prime is 421607. The reversal of 421590 is 95124.

421590 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

421590 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 31 ways as a sum of consecutive naturals, for example, 8947 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (18144).

2⁴²¹⁵⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580608).

421590 is an abundant number, since it is smaller than the sum of its proper divisors (739626).

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

421590 is a wasteful number, since it uses less digits than its factorization.

421590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 421590 is about 649.2996226705. The cubic root of 421590 is about 74.9831073066.

The spelling of 421590 in words is "four hundred twenty-one thousand, five hundred ninety".