820741 has 4 divisors (see below), whose sum is σ = 839872. Its totient is φ = 801612.

The previous prime is 820733. The next prime is 820747. The reversal of 820741 is 147028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 820741 - 2³ = 820733 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9501 + ... + 9586.

It is an arithmetic number, because the mean of its divisors is an integer number (209968).

2⁸²⁰⁷⁴¹ is an apocalyptic number.

It is an amenable number.

820741 is a deficient number, since it is larger than the sum of its proper divisors (19131).

820741 is a wasteful number, since it uses less digits than its factorization.

820741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19130.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 820741 is about 905.9475702269. The cubic root of 820741 is about 93.6272015931.

Adding to 820741 its reverse (147028), we get a palindrome (967769).

The spelling of 820741 in words is "eight hundred twenty thousand, seven hundred forty-one".