3955639878 has 12 divisors (see below), whose sum is σ = 8570553108. Its totient is φ = 1318546620.

The previous prime is 3955639871. The next prime is 3955639927. The reversal of 3955639878 is 8789365593.

3955639878 is a `hidden beast` number, since 3 + 9 + 556 + 3 + 9 + 8 + 78 = 666.

3955639878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3955639871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109878868 + ... + 109878903.

It is an arithmetic number, because the mean of its divisors is an integer number (714212759).

Almost surely, 2^3955639878 is an apocalyptic number.

3955639878 is an abundant number, since it is smaller than the sum of its proper divisors (4614913230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3955639878 is a wasteful number, since it uses less digits than its factorization.

3955639878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219757779 (or 219757776 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The square root of 3955639878 is about 62893.8779055641. The cubic root of 3955639878 is about 1581.5111161262.

The spelling of 3955639878 in words is "three billion, nine hundred fifty-five million, six hundred thirty-nine thousand, eight hundred seventy-eight".