421770 has 32 divisors (see below), whose sum is σ = 1073088. Its totient is φ = 105728.

The previous prime is 421741. The next prime is 421783. The reversal of 421770 is 77124.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 97 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (33534).

2⁴²¹⁷⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536544).

421770 is an abundant number, since it is smaller than the sum of its proper divisors (651318).

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

421770 is a wasteful number, since it uses less digits than its factorization.

421770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 421770 is about 649.4382187707. The cubic root of 421770 is about 74.9937772615.

Adding to 421770 its reverse (77124), we get a palindrome (498894).

The spelling of 421770 in words is "four hundred twenty-one thousand, seven hundred seventy", and thus it is an iban number.