3991189385 has 8 divisors (see below), whose sum is σ = 4856884416. Its totient is φ = 3147980080.

The previous prime is 3991189373. The next prime is 3991189387. The reversal of 3991189385 is 5839811993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3991189385 - 2²⁸ = 3722753929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991189385.

It is not an unprimeable number, because it can be changed into a prime (3991189387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5621039 + ... + 5621748.

It is an arithmetic number, because the mean of its divisors is an integer number (607110552).

Almost surely, 2^3991189385 is an apocalyptic number.

It is an amenable number.

3991189385 is a deficient number, since it is larger than the sum of its proper divisors (865695031).

3991189385 is a wasteful number, since it uses less digits than its factorization.

3991189385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11242863.

The product of its digits is 2099520, while the sum is 56.

The square root of 3991189385 is about 63175.8607776736. The cubic root of 3991189385 is about 1586.2346968965.

The spelling of 3991189385 in words is "three billion, nine hundred ninety-one million, one hundred eighty-nine thousand, three hundred eighty-five".