966821 has 4 divisors (see below), whose sum is σ = 990444. Its totient is φ = 943200.

The previous prime is 966817. The next prime is 966863. The reversal of 966821 is 128669.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 136900 + 829921 = 370^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 966821 - 2² = 966817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (966871) 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, 11750 + ... + 11831.

It is an arithmetic number, because the mean of its divisors is an integer number (247611).

2⁹⁶⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

966821 is a deficient number, since it is larger than the sum of its proper divisors (23623).

966821 is a wasteful number, since it uses less digits than its factorization.

966821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23622.

The product of its digits is 5184, while the sum is 32.

The square root of 966821 is about 983.2705629683. The cubic root of 966821 is about 98.8815711362.

The spelling of 966821 in words is "nine hundred sixty-six thousand, eight hundred twenty-one".