3969388647 has 24 divisors (see below), whose sum is σ = 6564463776. Its totient is φ = 2264129856.

The previous prime is 3969388613. The next prime is 3969388679. The reversal of 3969388647 is 7468839693.

It is not a de Polignac number, because 3969388647 - 2¹⁰ = 3969387623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3969388747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21468 + ... + 91649.

It is an arithmetic number, because the mean of its divisors is an integer number (273519324).

Almost surely, 2^3969388647 is an apocalyptic number.

3969388647 is a deficient number, since it is larger than the sum of its proper divisors (2595075129).

3969388647 is a wasteful number, since it uses less digits than its factorization.

3969388647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113687 (or 113684 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The square root of 3969388647 is about 63003.0844244946. The cubic root of 3969388647 is about 1583.3413035930.

The spelling of 3969388647 in words is "three billion, nine hundred sixty-nine million, three hundred eighty-eight thousand, six hundred forty-seven".