3990664 has 8 divisors (see below), whose sum is σ = 7482510. Its totient is φ = 1995328.

The previous prime is 3990641. The next prime is 3990689. The reversal of 3990664 is 4660993.

It can be written as a sum of positive squares in only one way, i.e., 2377764 + 1612900 = 1542^2 + 1270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249409 + ... + 249424.

Almost surely, 2^3990664 is an apocalyptic number.

It is an amenable number.

3990664 is a deficient number, since it is larger than the sum of its proper divisors (3491846).

3990664 is a wasteful number, since it uses less digits than its factorization.

3990664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498839 (or 498835 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 3990664 is about 1997.6646365194. The cubic root of 3990664 is about 158.6165091873.

The spelling of 3990664 in words is "three million, nine hundred ninety thousand, six hundred sixty-four".