3928986 has 40 divisors (see below), whose sum is σ = 8944320. Its totient is φ = 1288872.

The previous prime is 3928979. The next prime is 3928997. The reversal of 3928986 is 6898293.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12645 + ... + 12951.

It is an arithmetic number, because the mean of its divisors is an integer number (223608).

Almost surely, 2^3928986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3928986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4472160).

3928986 is an abundant number, since it is smaller than the sum of its proper divisors (5015334).

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

3928986 is a wasteful number, since it uses less digits than its factorization.

3928986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 391 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 3928986 is about 1982.1669959920. The cubic root of 3928986 is about 157.7950930250.

The spelling of 3928986 in words is "three million, nine hundred twenty-eight thousand, nine hundred eighty-six".