3990638 has 8 divisors (see below), whose sum is σ = 6246288. Its totient is φ = 1908544.

The previous prime is 3990619. The next prime is 3990641. The reversal of 3990638 is 8360993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43331 + ... + 43422.

It is an arithmetic number, because the mean of its divisors is an integer number (780786).

Almost surely, 2^3990638 is an apocalyptic number.

3990638 is a deficient number, since it is larger than the sum of its proper divisors (2255650).

3990638 is a wasteful number, since it uses less digits than its factorization.

3990638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86778.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 3990638 is about 1997.6581289099. The cubic root of 3990638 is about 158.6161647135.

The spelling of 3990638 in words is "three million, nine hundred ninety thousand, six hundred thirty-eight".