3989640 has 32 divisors (see below), whose sum is σ = 11969280. Its totient is φ = 1063872.

The previous prime is 3989593. The next prime is 3989641. The reversal of 3989640 is 469893.

It is not an unprimeable number, because it can be changed into a prime (3989641) 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, 16504 + ... + 16743.

It is an arithmetic number, because the mean of its divisors is an integer number (374040).

Almost surely, 2^3989640 is an apocalyptic number.

3989640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3989640 is an abundant number, since it is smaller than the sum of its proper divisors (7979640).

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

3989640 is a wasteful number, since it uses less digits than its factorization.

3989640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33261 (or 33257 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 3989640 is about 1997.4083207997. The cubic root of 3989640 is about 158.6029410861.

The spelling of 3989640 in words is "three million, nine hundred eighty-nine thousand, six hundred forty".