3945031994 has 8 divisors (see below), whose sum is σ = 6121601460. Its totient is φ = 1904498176.

The previous prime is 3945031963. The next prime is 3945032011. The reversal of 3945031994 is 4991305493.

It is a happy number.

3945031994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3673935769 + 271096225 = 60613^2 + 16465^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34008839 + ... + 34008954.

Almost surely, 2^3945031994 is an apocalyptic number.

3945031994 is a deficient number, since it is larger than the sum of its proper divisors (2176569466).

3945031994 is a wasteful number, since it uses less digits than its factorization.

3945031994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68017824.

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 3945031994 is about 62809.4896810983. The cubic root of 3945031994 is about 1580.0961317891.

The spelling of 3945031994 in words is "three billion, nine hundred forty-five million, thirty-one thousand, nine hundred ninety-four".