3965555538 has 24 divisors (see below), whose sum is σ = 9819471168. Its totient is φ = 1133015832.

The previous prime is 3965555519. The next prime is 3965555543. The reversal of 3965555538 is 8355555693.

3965555538 is a `hidden beast` number, since 3 + 9 + 6 + 55 + 55 + 538 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15736206 + ... + 15736457.

It is an arithmetic number, because the mean of its divisors is an integer number (409144632).

Almost surely, 2^3965555538 is an apocalyptic number.

3965555538 is an abundant number, since it is smaller than the sum of its proper divisors (5853915630).

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

3965555538 is a wasteful number, since it uses less digits than its factorization.

3965555538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31472678 (or 31472675 counting only the distinct ones).

The product of its digits is 12150000, while the sum is 54.

The square root of 3965555538 is about 62972.6570663808. The cubic root of 3965555538 is about 1582.8314791193.

The spelling of 3965555538 in words is "three billion, nine hundred sixty-five million, five hundred fifty-five thousand, five hundred thirty-eight".