3971880943 has 4 divisors (see below), whose sum is σ = 3973522608. Its totient is φ = 3970239280.

The previous prime is 3971880907. The next prime is 3971880949. The reversal of 3971880943 is 3490881793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3971880943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971880949) 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, 817198 + ... + 822043.

It is an arithmetic number, because the mean of its divisors is an integer number (993380652).

Almost surely, 2^3971880943 is an apocalyptic number.

3971880943 is a deficient number, since it is larger than the sum of its proper divisors (1641665).

3971880943 is a wasteful number, since it uses less digits than its factorization.

3971880943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641664.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 3971880943 is about 63022.8604793530. The cubic root of 3971880943 is about 1583.6726165426.

The spelling of 3971880943 in words is "three billion, nine hundred seventy-one million, eight hundred eighty thousand, nine hundred forty-three".