3945869840 has 80 divisors (see below), whose sum is σ = 10534950720. Its totient is φ = 1359336960.

The previous prime is 3945869839. The next prime is 3945869861. The reversal of 3945869840 is 489685493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101279 + ... + 134718.

It is an arithmetic number, because the mean of its divisors is an integer number (131686884).

Almost surely, 2^3945869840 is an apocalyptic number.

It is an amenable number.

3945869840 is an abundant number, since it is smaller than the sum of its proper divisors (6589080880).

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

3945869840 is a wasteful number, since it uses less digits than its factorization.

3945869840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236040 (or 236034 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 56.

The square root of 3945869840 is about 62816.1590675520. The cubic root of 3945869840 is about 1580.2079841573.

The spelling of 3945869840 in words is "three billion, nine hundred forty-five million, eight hundred sixty-nine thousand, eight hundred forty".