820929 has 4 divisors (see below), whose sum is σ = 1094576. Its totient is φ = 547284.

The previous prime is 820927. The next prime is 820957. The reversal of 820929 is 929028.

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 not a de Polignac number, because 820929 - 2¹ = 820927 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 820896 and 820905.

It is not an unprimeable number, because it can be changed into a prime (820921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136819 + ... + 136824.

It is an arithmetic number, because the mean of its divisors is an integer number (273644).

2⁸²⁰⁹²⁹ is an apocalyptic number.

It is an amenable number.

820929 is a deficient number, since it is larger than the sum of its proper divisors (273647).

820929 is a wasteful number, since it uses less digits than its factorization.

820929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273646.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 820929 is about 906.0513230496. The cubic root of 820929 is about 93.6343498369.

The spelling of 820929 in words is "eight hundred twenty thousand, nine hundred twenty-nine".