3861225778 has 4 divisors (see below), whose sum is σ = 5791838670. Its totient is φ = 1930612888.

The previous prime is 3861225773. The next prime is 3861225779. The reversal of 3861225778 is 8775221683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8775221683 = 101 ⋅86883383.

It can be written as a sum of positive squares in only one way, i.e., 3839909089 + 21316689 = 61967^2 + 4617^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3861225773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965306443 + ... + 965306446.

Almost surely, 2^3861225778 is an apocalyptic number.

3861225778 is a deficient number, since it is larger than the sum of its proper divisors (1930612892).

3861225778 is a wasteful number, since it uses less digits than its factorization.

3861225778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930612891.

The product of its digits is 1128960, while the sum is 49.

The square root of 3861225778 is about 62138.7622824916. The cubic root of 3861225778 is about 1568.8270382044.

The spelling of 3861225778 in words is "three billion, eight hundred sixty-one million, two hundred twenty-five thousand, seven hundred seventy-eight".