421040 has 40 divisors (see below), whose sum is σ = 1034160. Its totient is φ = 158976.

The previous prime is 421037. The next prime is 421049. The reversal of 421040 is 40124.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (25854).

2⁴²¹⁰⁴⁰ is an apocalyptic number.

421040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (517080).

421040 is an abundant number, since it is smaller than the sum of its proper divisors (613120).

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

421040 is a wasteful number, since it uses less digits than its factorization.

421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 421040 is about 648.8759511648. The cubic root of 421040 is about 74.9504858370.

Adding to 421040 its reverse (40124), we get a palindrome (461164).

The spelling of 421040 in words is "four hundred twenty-one thousand, forty", and thus it is an iban number.