3980640840 has 64 divisors (see below), whose sum is σ = 13027556160. Its totient is φ = 965003520.

The previous prime is 3980640803. The next prime is 3980640863. The reversal of 3980640840 is 480460893.

It is a junction number, because it is equal to n+sod(n) for n = 3980640792 and 3980640801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1506499 + ... + 1509138.

It is an arithmetic number, because the mean of its divisors is an integer number (203555565).

Almost surely, 2^3980640840 is an apocalyptic number.

3980640840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3980640840 is an abundant number, since it is smaller than the sum of its proper divisors (9046915320).

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

3980640840 is a wasteful number, since it uses less digits than its factorization.

3980640840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015662 (or 3015658 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 3980640840 is about 63092.3199763648. The cubic root of 3980640840 is about 1584.8360135119.

The spelling of 3980640840 in words is "three billion, nine hundred eighty million, six hundred forty thousand, eight hundred forty".