3800678821 has 2 divisors, whose sum is σ = 3800678822. Its totient is φ = 3800678820.

The previous prime is 3800678779. The next prime is 3800678939. The reversal of 3800678821 is 1288760083.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3785940900 + 14737921 = 61530^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 3800678821 - 2²⁷ = 3666461093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3800678621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1900339410 + 1900339411.

It is an arithmetic number, because the mean of its divisors is an integer number (1900339411).

Almost surely, 2^3800678821 is an apocalyptic number.

It is an amenable number.

3800678821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3800678821 is an equidigital number, since it uses as much as digits as its factorization.

3800678821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 3800678821 is about 61649.6457491850. The cubic root of 3800678821 is about 1560.5836656922.

The spelling of 3800678821 in words is "three billion, eight hundred million, six hundred seventy-eight thousand, eight hundred twenty-one".