820975 has 6 divisors (see below), whose sum is σ = 1018040. Its totient is φ = 656760.

The previous prime is 820969. The next prime is 820991. The reversal of 820975 is 579028.

It is not a de Polignac number, because 820975 - 2¹⁷ = 689903 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16395 + ... + 16444.

2⁸²⁰⁹⁷⁵ is an apocalyptic number.

820975 is a deficient number, since it is larger than the sum of its proper divisors (197065).

820975 is a wasteful number, since it uses less digits than its factorization.

820975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32849 (or 32844 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 820975 is about 906.0767075695. The cubic root of 820975 is about 93.6360987090.

The spelling of 820975 in words is "eight hundred twenty thousand, nine hundred seventy-five".