858381821 has 16 divisors (see below), whose sum is σ = 961728768. Its totient is φ = 759441600.

The previous prime is 858381773. The next prime is 858381859. The reversal of 858381821 is 128183858.

It is a cyclic number.

It is not a de Polignac number, because 858381821 - 2⁶ = 858381757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858381521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88991 + ... + 98163.

It is an arithmetic number, because the mean of its divisors is an integer number (60108048).

Almost surely, 2^858381821 is an apocalyptic number.

It is an amenable number.

858381821 is a deficient number, since it is larger than the sum of its proper divisors (103346947).

858381821 is a wasteful number, since it uses less digits than its factorization.

858381821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9412.

The product of its digits is 122880, while the sum is 44.

The square root of 858381821 is about 29298.1538838201. The cubic root of 858381821 is about 950.3717182461.

The spelling of 858381821 in words is "eight hundred fifty-eight million, three hundred eighty-one thousand, eight hundred twenty-one".