3978989 has 8 divisors (see below), whose sum is σ = 4569600. Its totient is φ = 3393936.

The previous prime is 3978979. The next prime is 3979013. The reversal of 3978989 is 9898793.

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

It is not a de Polignac number, because 3978989 - 2²⁰ = 2930413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3978989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287 + ... + 2835.

It is an arithmetic number, because the mean of its divisors is an integer number (571200).

Almost surely, 2^3978989 is an apocalyptic number.

It is an amenable number.

3978989 is a deficient number, since it is larger than the sum of its proper divisors (590611).

3978989 is a wasteful number, since it uses less digits than its factorization.

3978989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779.

The product of its digits is 979776, while the sum is 53.

The square root of 3978989 is about 1994.7403339783. The cubic root of 3978989 is about 158.4616764248.

The spelling of 3978989 in words is "three million, nine hundred seventy-eight thousand, nine hundred eighty-nine".