824421 has 8 divisors (see below), whose sum is σ = 1183840. Its totient is φ = 507312.

The previous prime is 824419. The next prime is 824437. The reversal of 824421 is 124428.

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

It is not a de Polignac number, because 824421 - 2¹ = 824419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (824401) 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, 10531 + ... + 10608.

It is an arithmetic number, because the mean of its divisors is an integer number (147980).

2⁸²⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

824421 is a deficient number, since it is larger than the sum of its proper divisors (359419).

824421 is a wasteful number, since it uses less digits than its factorization.

824421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21155.

The product of its digits is 512, while the sum is 21.

The square root of 824421 is about 907.9763212772. The cubic root of 824421 is about 93.7669267214.

Adding to 824421 its reverse (124428), we get a palindrome (948849).

The spelling of 824421 in words is "eight hundred twenty-four thousand, four hundred twenty-one".