3985664 has 18 divisors (see below), whose sum is σ = 7956270. Its totient is φ = 1992704.

The previous prime is 3985661. The next prime is 3985669. The reversal of 3985664 is 4665893.

It can be written as a sum of positive squares in only one way, i.e., 3211264 + 774400 = 1792^2 + 880^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7529 + ... + 8040.

It is an arithmetic number, because the mean of its divisors is an integer number (442015).

Almost surely, 2^3985664 is an apocalyptic number.

It is an amenable number.

3985664 is a deficient number, since it is larger than the sum of its proper divisors (3970606).

3985664 is an equidigital number, since it uses as much as digits as its factorization.

3985664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15585 (or 15571 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 3985664 is about 1996.4127829685. The cubic root of 3985664 is about 158.5502366739.

The spelling of 3985664 in words is "three million, nine hundred eighty-five thousand, six hundred sixty-four".