3878902861 has 2 divisors, whose sum is σ = 3878902862. Its totient is φ = 3878902860.

The previous prime is 3878902843. The next prime is 3878902901. The reversal of 3878902861 is 1682098783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2016548836 + 1862354025 = 44906^2 + 43155^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878902861 - 2¹⁹ = 3878378573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3878902799 and 3878902808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3878932861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939451430 + 1939451431.

It is an arithmetic number, because the mean of its divisors is an integer number (1939451431).

Almost surely, 2^3878902861 is an apocalyptic number.

It is an amenable number.

3878902861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878902861 is an equidigital number, since it uses as much as digits as its factorization.

3878902861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 3878902861 is about 62280.8386343665. The cubic root of 3878902861 is about 1571.2174770844.

The spelling of 3878902861 in words is "three billion, eight hundred seventy-eight million, nine hundred two thousand, eight hundred sixty-one".