421826 has 4 divisors (see below), whose sum is σ = 632742. Its totient is φ = 210912.

The previous prime is 421807. The next prime is 421831. The reversal of 421826 is 628124.

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

It can be written as a sum of positive squares in only one way, i.e., 421201 + 625 = 649^2 + 25^2 .

It is an unprimeable number.

421826 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 as a sum of consecutive naturals, namely, 105455 + ... + 105458.

2⁴²¹⁸²⁶ is an apocalyptic number.

421826 is a deficient number, since it is larger than the sum of its proper divisors (210916).

421826 is a wasteful number, since it uses less digits than its factorization.

421826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210915.

The product of its digits is 768, while the sum is 23.

The square root of 421826 is about 649.4813315254. The cubic root of 421826 is about 74.9970961839.

The spelling of 421826 in words is "four hundred twenty-one thousand, eight hundred twenty-six".