3820421840 has 20 divisors (see below), whose sum is σ = 8882480964. Its totient is φ = 1528168704.

The previous prime is 3820421821. The next prime is 3820421851. The reversal of 3820421840 is 481240283.

It can be written as a sum of positive squares in 2 ways, for example, as 793661584 + 3026760256 = 28172^2 + 55016^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 3820421797 and 3820421806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23877557 + ... + 23877716.

Almost surely, 2^3820421840 is an apocalyptic number.

It is an amenable number.

3820421840 is an abundant number, since it is smaller than the sum of its proper divisors (5062059124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3820421840 is a wasteful number, since it uses less digits than its factorization.

3820421840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47755286 (or 47755280 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 3820421840 is about 61809.5610727014. The cubic root of 3820421840 is about 1563.2812045767.

The spelling of 3820421840 in words is "three billion, eight hundred twenty million, four hundred twenty-one thousand, eight hundred forty".