3872804821 has 2 divisors, whose sum is σ = 3872804822. Its totient is φ = 3872804820.

The previous prime is 3872804809. The next prime is 3872804843. The reversal of 3872804821 is 1284082783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2736440721 + 1136364100 = 52311^2 + 33710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3872804821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3872804801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1936402410 + 1936402411.

It is an arithmetic number, because the mean of its divisors is an integer number (1936402411).

Almost surely, 2^3872804821 is an apocalyptic number.

It is an amenable number.

3872804821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3872804821 is an equidigital number, since it uses as much as digits as its factorization.

3872804821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 3872804821 is about 62231.8633900673. The cubic root of 3872804821 is about 1570.3936726293.

The spelling of 3872804821 in words is "three billion, eight hundred seventy-two million, eight hundred four thousand, eight hundred twenty-one".