421654 has 4 divisors (see below), whose sum is σ = 632484. Its totient is φ = 210826.

The previous prime is 421643. The next prime is 421657. The reversal of 421654 is 456124.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421657) 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 as a sum of consecutive naturals, namely, 105412 + ... + 105415.

It is an arithmetic number, because the mean of its divisors is an integer number (158121).

2⁴²¹⁶⁵⁴ is an apocalyptic number.

421654 is a deficient number, since it is larger than the sum of its proper divisors (210830).

421654 is a wasteful number, since it uses less digits than its factorization.

421654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210829.

The product of its digits is 960, while the sum is 22.

The square root of 421654 is about 649.3489046730. The cubic root of 421654 is about 74.9869014162.

Adding to 421654 its reverse (456124), we get a palindrome (877778).

The spelling of 421654 in words is "four hundred twenty-one thousand, six hundred fifty-four".