421624 has 16 divisors (see below), whose sum is σ = 903600. Its totient is φ = 180672.

The previous prime is 421621. The next prime is 421633. The reversal of 421624 is 426124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3709 + ... + 3820.

It is an arithmetic number, because the mean of its divisors is an integer number (56475).

2⁴²¹⁶²⁴ is an apocalyptic number.

It is an amenable number.

421624 is an abundant number, since it is smaller than the sum of its proper divisors (481976).

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

421624 is a wasteful number, since it uses less digits than its factorization.

421624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7542 (or 7538 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 421624 is about 649.3258042000. The cubic root of 421624 is about 74.9851229751.

Adding to 421624 its reverse (426124), we get a palindrome (847748).

The spelling of 421624 in words is "four hundred twenty-one thousand, six hundred twenty-four".