3947718640 has 40 divisors (see below), whose sum is σ = 9199821888. Its totient is φ = 1575409920.

The previous prime is 3947718581. The next prime is 3947718751. The reversal of 3947718640 is 468177493.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22767 + ... + 91726.

Almost surely, 2^3947718640 is an apocalyptic number.

It is an amenable number.

3947718640 is an abundant number, since it is smaller than the sum of its proper divisors (5252103248).

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

3947718640 is a wasteful number, since it uses less digits than its factorization.

3947718640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114937 (or 114931 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 3947718640 is about 62830.8733028596. The cubic root of 3947718640 is about 1580.4547427918.

The spelling of 3947718640 in words is "three billion, nine hundred forty-seven million, seven hundred eighteen thousand, six hundred forty".