421554 has 16 divisors (see below), whose sum is σ = 963648. Its totient is φ = 120432.

The previous prime is 421517. The next prime is 421559. The reversal of 421554 is 455124.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 421554.

It is not an unprimeable number, because it can be changed into a prime (421559) by changing a digit.

421554 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 4977 + ... + 5060.

It is an arithmetic number, because the mean of its divisors is an integer number (60228).

2⁴²¹⁵⁵⁴ is an apocalyptic number.

421554 is an abundant number, since it is smaller than the sum of its proper divisors (542094).

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

421554 is a wasteful number, since it uses less digits than its factorization.

421554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10049.

The product of its digits is 800, while the sum is 21.

The square root of 421554 is about 649.2718999002. The cubic root of 421554 is about 74.9809729511.

Adding to 421554 its reverse (455124), we get a palindrome (876678).

It can be divided in two parts, 42 and 1554, that added together give a triangular number (1596 = T₅₆).

The spelling of 421554 in words is "four hundred twenty-one thousand, five hundred fifty-four".