3978241669809 has 45 divisors (see below), whose sum is σ = 6532498835401. Its totient is φ = 2410935884280.

The previous prime is 3978241669781. The next prime is 3978241669859. The reversal of 3978241669809 is 9089661428793.

The square root of 3978241669809 is 1994553.

It is a perfect power (a square), and thus also a powerful number.

3978241669809 is a `hidden beast` number, since 3 + 9 + 78 + 2 + 416 + 69 + 80 + 9 = 666.

It is not a de Polignac number, because 3978241669809 - 2⁷ = 3978241669681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3978241669859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 197450674 + ... + 197470820.

Almost surely, 2^{3978241669809} is an apocalyptic number.

3978241669809 is the 1994553-rd square number.

3978241669809 is the 997277-th centered octagonal number.

It is an amenable number.

3978241669809 is a deficient number, since it is larger than the sum of its proper divisors (2554257165592).

3978241669809 is an frugal number, since it uses more digits than its factorization.

3978241669809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40328 (or 20161 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 72.

The spelling of 3978241669809 in words is "three trillion, nine hundred seventy-eight billion, two hundred forty-one million, six hundred sixty-nine thousand, eight hundred nine".