3928907840 has 224 divisors, whose sum is σ = 11472281856. Its totient is φ = 1261117440.

The previous prime is 3928907821. The next prime is 3928907867. The reversal of 3928907840 is 487098293.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050614 + ... + 1054346.

It is an arithmetic number, because the mean of its divisors is an integer number (51215544).

Almost surely, 2^3928907840 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 3928907840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5736140928).

3928907840 is an abundant number, since it is smaller than the sum of its proper divisors (7543374016).

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

3928907840 is a wasteful number, since it uses less digits than its factorization.

3928907840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797 (or 3787 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 3928907840 is about 62681.0006301750. Note that the first 3 decimals coincide. The cubic root of 3928907840 is about 1577.9404666967.

The spelling of 3928907840 in words is "three billion, nine hundred twenty-eight million, nine hundred seven thousand, eight hundred forty".