813421 has 8 divisors (see below), whose sum is σ = 961920. Its totient is φ = 673008.

The previous prime is 813419. The next prime is 813427. The reversal of 813421 is 124318.

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

It is not a de Polignac number, because 813421 - 2¹ = 813419 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 (813427) 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 in 7 ways as a sum of consecutive naturals, for example, 1801 + ... + 2206.

It is an arithmetic number, because the mean of its divisors is an integer number (120240).

2⁸¹³⁴²¹ is an apocalyptic number.

It is an amenable number.

813421 is a deficient number, since it is larger than the sum of its proper divisors (148499).

813421 is a wasteful number, since it uses less digits than its factorization.

813421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043.

The product of its digits is 192, while the sum is 19.

The square root of 813421 is about 901.8985530535. The cubic root of 813421 is about 93.3480234814.

Adding to 813421 its reverse (124318), we get a palindrome (937739).

The spelling of 813421 in words is "eight hundred thirteen thousand, four hundred twenty-one".