3945939520 has 224 divisors, whose sum is σ = 10138867200. Its totient is φ = 1460035584.

The previous prime is 3945939509. The next prime is 3945939521. The reversal of 3945939520 is 259395493.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3945939521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36201226 + ... + 36201334.

It is an arithmetic number, because the mean of its divisors is an integer number (45262800).

Almost surely, 2^3945939520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3945939520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5069433600).

3945939520 is an abundant number, since it is smaller than the sum of its proper divisors (6192927680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3945939520 is a wasteful number, since it uses less digits than its factorization.

3945939520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 49.

The square root of 3945939520 is about 62816.7136994606. The cubic root of 3945939520 is about 1580.2172857181.

The spelling of 3945939520 in words is "three billion, nine hundred forty-five million, nine hundred thirty-nine thousand, five hundred twenty".