821368 has 16 divisors (see below), whose sum is σ = 1559880. Its totient is φ = 405408.

The previous prime is 821333. The next prime is 821377. The reversal of 821368 is 863128.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 1282.

2⁸²¹³⁶⁸ is an apocalyptic number.

It is an amenable number.

821368 is a deficient number, since it is larger than the sum of its proper divisors (738512).

821368 is a wasteful number, since it uses less digits than its factorization.

821368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326 (or 1322 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 821368 is about 906.2935506777. The cubic root of 821368 is about 93.6510374979.

It can be divided in two parts, 8213 and 68, that added together give a square (8281 = 91²).

The spelling of 821368 in words is "eight hundred twenty-one thousand, three hundred sixty-eight".