3929856 has 144 divisors (see below), whose sum is σ = 12950784. Its totient is φ = 1032192.

The previous prime is 3929843. The next prime is 3929857. The reversal of 3929856 is 6589293.

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (116640) is a multiple of the sum of its prime divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3929857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91371 + ... + 91413.

It is an arithmetic number, because the mean of its divisors is an integer number (89936).

Almost surely, 2^3929856 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 3929856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6475392).

3929856 is an abundant number, since it is smaller than the sum of its proper divisors (9020928).

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

3929856 is a wasteful number, since it uses less digits than its factorization.

3929856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 72 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 3929856 is about 1982.3864406316. The cubic root of 3929856 is about 157.8067390832.

The spelling of 3929856 in words is "three million, nine hundred twenty-nine thousand, eight hundred fifty-six".