3978439605 has 192 divisors, whose sum is σ = 8720179200. Its totient is φ = 1712430720.

The previous prime is 3978439601. The next prime is 3978439643. The reversal of 3978439605 is 5069348793.

It is not a de Polignac number, because 3978439605 - 2² = 3978439601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978439601) by changing a digit.

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 191 ways as a sum of consecutive naturals, for example, 12019290 + ... + 12019620.

It is an arithmetic number, because the mean of its divisors is an integer number (45417600).

Almost surely, 2^3978439605 is an apocalyptic number.

3978439605 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3978439605 is an abundant number, since it is smaller than the sum of its proper divisors (4741739595).

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

3978439605 is a wasteful number, since it uses less digits than its factorization.

3978439605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The square root of 3978439605 is about 63074.8730081956. The cubic root of 3978439605 is about 1584.5438294234.

The spelling of 3978439605 in words is "three billion, nine hundred seventy-eight million, four hundred thirty-nine thousand, six hundred five".