421634 has 8 divisors (see below), whose sum is σ = 669708. Its totient is φ = 198400.

The previous prime is 421633. The next prime is 421639. The reversal of 421634 is 436124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 418609 + 3025 = 647^2 + 55^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (421633) 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, 6167 + ... + 6234.

2⁴²¹⁶³⁴ is an apocalyptic number.

421634 is a deficient number, since it is larger than the sum of its proper divisors (248074).

421634 is a wasteful number, since it uses less digits than its factorization.

421634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12420.

The product of its digits is 576, while the sum is 20.

The square root of 421634 is about 649.3335044490. Note that the first 3 decimals coincide. The cubic root of 421634 is about 74.9857157982.

Adding to 421634 its reverse (436124), we get a palindrome (857758).

The spelling of 421634 in words is "four hundred twenty-one thousand, six hundred thirty-four".