820475 has 12 divisors (see below), whose sum is σ = 1046064. Its totient is φ = 637920.

The previous prime is 820459. The next prime is 820481. The reversal of 820475 is 574028.

It is not a de Polignac number, because 820475 - 2⁴ = 820459 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 482 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (87172).

2⁸²⁰⁴⁷⁵ is an apocalyptic number.

820475 is a deficient number, since it is larger than the sum of its proper divisors (225589).

820475 is a wasteful number, since it uses less digits than its factorization.

820475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 820475 is about 905.8007507173. The cubic root of 820475 is about 93.6170857236.

The spelling of 820475 in words is "eight hundred twenty thousand, four hundred seventy-five".