421620 has 24 divisors (see below), whose sum is σ = 1180704. Its totient is φ = 112416.

The previous prime is 421609. The next prime is 421621. The reversal of 421620 is 26124.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 421620.

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 7 ways as a sum of consecutive naturals, for example, 3454 + ... + 3573.

It is an arithmetic number, because the mean of its divisors is an integer number (49196).

2⁴²¹⁶²⁰ is an apocalyptic number.

It is an amenable number.

421620 is an abundant number, since it is smaller than the sum of its proper divisors (759084).

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

421620 is a wasteful number, since it uses less digits than its factorization.

421620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039 (or 7037 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 421620 is about 649.3227240749. The cubic root of 421620 is about 74.9848858433.

Adding to 421620 its reverse (26124), we get a palindrome (447744).

The spelling of 421620 in words is "four hundred twenty-one thousand, six hundred twenty".