3879669781 has 4 divisors (see below), whose sum is σ = 4178105932. Its totient is φ = 3581233632.

The previous prime is 3879669757. The next prime is 3879669803. The reversal of 3879669781 is 1879669783.

3879669781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2416607281 + 1463062500 = 49159^2 + 38250^2 .

It is a cyclic number.

It is not a de Polignac number, because 3879669781 - 2⁷ = 3879669653 is a prime.

It is a super-2 number, since 2×3879669781² = 30103675219209175922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3879669721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149218056 + ... + 149218081.

It is an arithmetic number, because the mean of its divisors is an integer number (1044526483).

Almost surely, 2^3879669781 is an apocalyptic number.

It is an amenable number.

3879669781 is a deficient number, since it is larger than the sum of its proper divisors (298436151).

3879669781 is a wasteful number, since it uses less digits than its factorization.

3879669781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298436150.

The product of its digits is 27433728, while the sum is 64.

The square root of 3879669781 is about 62286.9952799138. The cubic root of 3879669781 is about 1571.3210217157.

The spelling of 3879669781 in words is "three billion, eight hundred seventy-nine million, six hundred sixty-nine thousand, seven hundred eighty-one".