3989918 has 4 divisors (see below), whose sum is σ = 5984880. Its totient is φ = 1994958.

The previous prime is 3989903. The next prime is 3989929. The reversal of 3989918 is 8199893.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 997478 + ... + 997481.

It is an arithmetic number, because the mean of its divisors is an integer number (1496220).

Almost surely, 2^3989918 is an apocalyptic number.

3989918 is a deficient number, since it is larger than the sum of its proper divisors (1994962).

3989918 is a wasteful number, since it uses less digits than its factorization.

3989918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994961.

The product of its digits is 139968, while the sum is 47.

The square root of 3989918 is about 1997.4779097652. The cubic root of 3989918 is about 158.6066248431.

The spelling of 3989918 in words is "three million, nine hundred eighty-nine thousand, nine hundred eighteen".