3991446143 has 4 divisors (see below), whose sum is σ = 4001707320. Its totient is φ = 3981184968.

The previous prime is 3991446127. The next prime is 3991446191. The reversal of 3991446143 is 3416441993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3416441993 = 709 ⋅4818677.

It is a cyclic number.

It is not a de Polignac number, because 3991446143 - 2⁴ = 3991446127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3991446094 and 3991446103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991446443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5130005 + ... + 5130782.

It is an arithmetic number, because the mean of its divisors is an integer number (1000426830).

Almost surely, 2^3991446143 is an apocalyptic number.

3991446143 is a deficient number, since it is larger than the sum of its proper divisors (10261177).

3991446143 is a wasteful number, since it uses less digits than its factorization.

3991446143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10261176.

The product of its digits is 279936, while the sum is 44.

The square root of 3991446143 is about 63177.8928344401. The cubic root of 3991446143 is about 1586.2687109606.

The spelling of 3991446143 in words is "three billion, nine hundred ninety-one million, four hundred forty-six thousand, one hundred forty-three".