975821 has 32 divisors (see below), whose sum is σ = 1382400. Its totient is φ = 665280.

The previous prime is 975811. The next prime is 975823. The reversal of 975821 is 128579.

It is a de Polignac number, because none of the positive numbers 2^k-975821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (975823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33635 + ... + 33663.

It is an arithmetic number, because the mean of its divisors is an integer number (43200).

2⁹⁷⁵⁸²¹ is an apocalyptic number.

It is an amenable number.

975821 is a deficient number, since it is larger than the sum of its proper divisors (406579).

975821 is a wasteful number, since it uses less digits than its factorization.

975821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89.

The product of its digits is 5040, while the sum is 32.

The square root of 975821 is about 987.8365249372. The cubic root of 975821 is about 99.1874488218.

It can be divided in two parts, 9758 and 21, that added together give a palindrome (9779).

The spelling of 975821 in words is "nine hundred seventy-five thousand, eight hundred twenty-one".