713821 has 4 divisors (see below), whose sum is σ = 720252. Its totient is φ = 707392.

The previous prime is 713807. The next prime is 713827. The reversal of 713821 is 128317.

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

It can be written as a sum of positive squares in 2 ways, for example, as 151321 + 562500 = 389^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 713821 - 2⁹ = 713309 is a prime.

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 an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 713792 and 713801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (713827) 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 3 ways as a sum of consecutive naturals, for example, 3046 + ... + 3271.

It is an arithmetic number, because the mean of its divisors is an integer number (180063).

2⁷¹³⁸²¹ is an apocalyptic number.

It is an amenable number.

713821 is a deficient number, since it is larger than the sum of its proper divisors (6431).

713821 is a wasteful number, since it uses less digits than its factorization.

713821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430.

The product of its digits is 336, while the sum is 22.

The square root of 713821 is about 844.8792813178. The cubic root of 713821 is about 89.3709635160.

The spelling of 713821 in words is "seven hundred thirteen thousand, eight hundred twenty-one".