4840639821 has 24 divisors (see below), whose sum is σ = 7050898296. Its totient is φ = 3200025600.

The previous prime is 4840639781. The next prime is 4840639829. The reversal of 4840639821 is 1289360484.

It is a happy number.

4840639821 is a `hidden beast` number, since 4 + 8 + 4 + 0 + 639 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4574493225 + 266146596 = 67635^2 + 16314^2 .

It is not a de Polignac number, because 4840639821 - 2⁷ = 4840639693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4840639829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 620481 + ... + 628233.

It is an arithmetic number, because the mean of its divisors is an integer number (293787429).

Almost surely, 2^4840639821 is an apocalyptic number.

It is an amenable number.

4840639821 is a deficient number, since it is larger than the sum of its proper divisors (2210258475).

4840639821 is a wasteful number, since it uses less digits than its factorization.

4840639821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8333 (or 8330 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 4840639821 is about 69574.7067618686. The cubic root of 4840639821 is about 1691.6126456395.

The spelling of 4840639821 in words is "four billion, eight hundred forty million, six hundred thirty-nine thousand, eight hundred twenty-one".