821872383 has 8 divisors (see below), whose sum is σ = 1133617200. Its totient is φ = 529021248.

The previous prime is 821872351. The next prime is 821872393. The reversal of 821872383 is 383278128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 821872383 - 2⁵ = 821872351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821872333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4723318 + ... + 4723491.

It is an arithmetic number, because the mean of its divisors is an integer number (141702150).

Almost surely, 2^821872383 is an apocalyptic number.

821872383 is a deficient number, since it is larger than the sum of its proper divisors (311744817).

821872383 is a wasteful number, since it uses less digits than its factorization.

821872383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446841.

The product of its digits is 129024, while the sum is 42.

The square root of 821872383 is about 28668.3167102640. The cubic root of 821872383 is about 936.7020321721.

It can be divided in two parts, 8218 and 72383, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 821872383 in words is "eight hundred twenty-one million, eight hundred seventy-two thousand, three hundred eighty-three".