3938645556 has 72 divisors (see below), whose sum is σ = 10318482720. Its totient is φ = 1265253696.

The previous prime is 3938645479. The next prime is 3938645593. The reversal of 3938645556 is 6555468393.

It is a happy number.

3938645556 is a `hidden beast` number, since 3 + 9 + 3 + 86 + 4 + 5 + 556 = 666.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 609615 + ... + 616041.

It is an arithmetic number, because the mean of its divisors is an integer number (143312260).

Almost surely, 2^3938645556 is an apocalyptic number.

3938645556 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3938645556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5159241360).

3938645556 is an abundant number, since it is smaller than the sum of its proper divisors (6379837164).

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

3938645556 is a wasteful number, since it uses less digits than its factorization.

3938645556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7053 (or 7048 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 54.

The square root of 3938645556 is about 62758.6293349369. The cubic root of 3938645556 is about 1579.2430219969.

The spelling of 3938645556 in words is "three billion, nine hundred thirty-eight million, six hundred forty-five thousand, five hundred fifty-six".