849724821 has 48 divisors (see below), whose sum is σ = 1492395840. Its totient is φ = 459164160.

The previous prime is 849724807. The next prime is 849724823. The reversal of 849724821 is 128427948.

849724821 is a `hidden beast` number, since 84 + 97 + 2 + 482 + 1 = 666.

849724821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 849724821 - 2¹¹ = 849722773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849724823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18691 + ... + 45263.

It is an arithmetic number, because the mean of its divisors is an integer number (31091580).

Almost surely, 2^849724821 is an apocalyptic number.

It is an amenable number.

849724821 is a deficient number, since it is larger than the sum of its proper divisors (642671019).

849724821 is a wasteful number, since it uses less digits than its factorization.

849724821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26626 (or 26623 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 849724821 is about 29150.0398112936. The cubic root of 849724821 is about 947.1660032797.

The spelling of 849724821 in words is "eight hundred forty-nine million, seven hundred twenty-four thousand, eight hundred twenty-one".