3990994 has 8 divisors (see below), whose sum is σ = 6841728. Its totient is φ = 1710420.

The previous prime is 3990979. The next prime is 3990997. The reversal of 3990994 is 4990993.

3990994 is nontrivially palindromic in base 9.

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

It is a self number, because there is not a number n which added to its sum of digits gives 3990994.

It is not an unprimeable number, because it can be changed into a prime (3990997) by changing a digit.

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, 142522 + ... + 142549.

It is an arithmetic number, because the mean of its divisors is an integer number (855216).

Almost surely, 2^3990994 is an apocalyptic number.

3990994 is a deficient number, since it is larger than the sum of its proper divisors (2850734).

3990994 is a wasteful number, since it uses less digits than its factorization.

3990994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285080.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 3990994 is about 1997.7472312582. The cubic root of 3990994 is about 158.6208812255.

Subtracting 3990994 from its reverse (4990993), we obtain a palindrome (999999).

The spelling of 3990994 in words is "three million, nine hundred ninety thousand, nine hundred ninety-four".