3990945071 has 4 divisors (see below), whose sum is σ = 3991102200. Its totient is φ = 3990787944.

The previous prime is 3990945067. The next prime is 3990945121. The reversal of 3990945071 is 1705490993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1705490993 = 59 ⋅28906627.

It is a cyclic number.

It is not a de Polignac number, because 3990945071 - 2² = 3990945067 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 (3990945001) 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, 30776 + ... + 94493.

It is an arithmetic number, because the mean of its divisors is an integer number (997775550).

Almost surely, 2^3990945071 is an apocalyptic number.

3990945071 is a deficient number, since it is larger than the sum of its proper divisors (157129).

3990945071 is a wasteful number, since it uses less digits than its factorization.

3990945071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157128.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 3990945071 is about 63173.9271456192. The cubic root of 3990945071 is about 1586.2023299991.

The spelling of 3990945071 in words is "three billion, nine hundred ninety million, nine hundred forty-five thousand, seventy-one".