421240 has 16 divisors (see below), whose sum is σ = 947880. Its totient is φ = 168480.

The previous prime is 421207. The next prime is 421241. The reversal of 421240 is 42124.

It is a self number, because there is not a number n which added to its sum of digits gives 421240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5226 + ... + 5305.

2⁴²¹²⁴⁰ is an apocalyptic number.

421240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421240 is an abundant number, since it is smaller than the sum of its proper divisors (526640).

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

421240 is a wasteful number, since it uses less digits than its factorization.

421240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542 (or 10538 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 421240 is about 649.0300455295. The cubic root of 421240 is about 74.9623514747.

Adding to 421240 its reverse (42124), we get a palindrome (463364).

The spelling of 421240 in words is "four hundred twenty-one thousand, two hundred forty", and thus it is an iban number.