821960 has 16 divisors (see below), whose sum is σ = 1849500. Its totient is φ = 328768.

The previous prime is 821941. The next prime is 821971. The reversal of 821960 is 69128.

It can be written as a sum of positive squares in 2 ways, for example, as 770884 + 51076 = 878^2 + 226^2 .

It is an unprimeable number.

821960 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10235 + ... + 10314.

2⁸²¹⁹⁶⁰ is an apocalyptic number.

It is an amenable number.

821960 is an abundant number, since it is smaller than the sum of its proper divisors (1027540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821960 is a wasteful number, since it uses less digits than its factorization.

821960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20560 (or 20556 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 821960 is about 906.6200968432. The cubic root of 821960 is about 93.6735317188.

The spelling of 821960 in words is "eight hundred twenty-one thousand, nine hundred sixty".