821383 has 2 divisors, whose sum is σ = 821384. Its totient is φ = 821382.

The previous prime is 821377. The next prime is 821411. The reversal of 821383 is 383128.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821383 is a prime.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410691 + 410692.

It is an arithmetic number, because the mean of its divisors is an integer number (410692).

2⁸²¹³⁸³ is an apocalyptic number.

821383 is a deficient number, since it is larger than the sum of its proper divisors (1).

821383 is an equidigital number, since it uses as much as digits as its factorization.

821383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 821383 is about 906.3018261043. The cubic root of 821383 is about 93.6516075862.

The spelling of 821383 in words is "eight hundred twenty-one thousand, three hundred eighty-three".