970821 has 12 divisors (see below), whose sum is σ = 1411020. Its totient is φ = 643200.

The previous prime is 970817. The next prime is 970829. The reversal of 970821 is 128079.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 408321 = 750^2 + 639^2 .

It is not a de Polignac number, because 970821 - 2² = 970817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (970829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2221 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (117585).

2⁹⁷⁰⁸²¹ is an apocalyptic number.

It is an amenable number.

970821 is a deficient number, since it is larger than the sum of its proper divisors (440199).

970821 is a wasteful number, since it uses less digits than its factorization.

970821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 970821 is about 985.3024916238. The cubic root of 970821 is about 99.0177501078.

The spelling of 970821 in words is "nine hundred seventy thousand, eight hundred twenty-one".