3989920 has 48 divisors (see below), whose sum is σ = 10287648. Its totient is φ = 1450240.

The previous prime is 3989903. The next prime is 3989929. The reversal of 3989920 is 299893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (3989929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (214326).

Almost surely, 2^3989920 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 3989920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5143824).

3989920 is an abundant number, since it is smaller than the sum of its proper divisors (6297728).

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

3989920 is a wasteful number, since it uses less digits than its factorization.

3989920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293 (or 2285 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 3989920 is about 1997.4784103965. The cubic root of 3989920 is about 158.6066513444.

The spelling of 3989920 in words is "three million, nine hundred eighty-nine thousand, nine hundred twenty".