3897989 has 4 divisors (see below), whose sum is σ = 3924300. Its totient is φ = 3871680.

The previous prime is 3897973. The next prime is 3898001. The reversal of 3897989 is 9897983.

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

It can be written as a sum of positive squares in 2 ways, for example, as 693889 + 3204100 = 833^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 3897989 - 2⁴ = 3897973 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3897989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897389) 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, 12932 + ... + 13229.

It is an arithmetic number, because the mean of its divisors is an integer number (981075).

Almost surely, 2^3897989 is an apocalyptic number.

It is an amenable number.

3897989 is a deficient number, since it is larger than the sum of its proper divisors (26311).

3897989 is a wasteful number, since it uses less digits than its factorization.

3897989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26310.

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

The square root of 3897989 is about 1974.3325454442. The cubic root of 3897989 is about 157.3790319987.

The spelling of 3897989 in words is "three million, eight hundred ninety-seven thousand, nine hundred eighty-nine".