821857483 has 4 divisors (see below), whose sum is σ = 865113160. Its totient is φ = 778601808.

The previous prime is 821857471. The next prime is 821857499. The reversal of 821857483 is 384758128.

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

It is a cyclic number.

It is not a de Polignac number, because 821857483 - 2²⁵ = 788303051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821857403) 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, 21627810 + ... + 21627847.

It is an arithmetic number, because the mean of its divisors is an integer number (216278290).

Almost surely, 2^821857483 is an apocalyptic number.

821857483 is a deficient number, since it is larger than the sum of its proper divisors (43255677).

821857483 is a wasteful number, since it uses less digits than its factorization.

821857483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43255676.

The product of its digits is 430080, while the sum is 46.

The square root of 821857483 is about 28668.0568403232. The cubic root of 821857483 is about 936.6963715428.

The spelling of 821857483 in words is "eight hundred twenty-one million, eight hundred fifty-seven thousand, four hundred eighty-three".