3911778440 has 16 divisors (see below), whose sum is σ = 8801501580. Its totient is φ = 1564711360.

The previous prime is 3911778433. The next prime is 3911778443. The reversal of 3911778440 is 448771193.

It can be written as a sum of positive squares in 2 ways, for example, as 3911501764 + 276676 = 62542^2 + 526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3911778391 and 3911778400.

It is not an unprimeable number, because it can be changed into a prime (3911778443) 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, 48897191 + ... + 48897270.

Almost surely, 2^3911778440 is an apocalyptic number.

It is an amenable number.

3911778440 is an abundant number, since it is smaller than the sum of its proper divisors (4889723140).

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

3911778440 is a wasteful number, since it uses less digits than its factorization.

3911778440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97794472 (or 97794468 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 3911778440 is about 62544.2118824756. The cubic root of 3911778440 is about 1575.6439379166.

The spelling of 3911778440 in words is "three billion, nine hundred eleven million, seven hundred seventy-eight thousand, four hundred forty".