3988565 has 16 divisors (see below), whose sum is σ = 5539968. Its totient is φ = 2700096.

The previous prime is 3988541. The next prime is 3988583. The reversal of 3988565 is 5658893.

It is not a de Polignac number, because 3988565 - 2¹⁴ = 3972181 is a prime.

It is an Ulam number.

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 15 ways as a sum of consecutive naturals, for example, 2219 + ... + 3591.

It is an arithmetic number, because the mean of its divisors is an integer number (346248).

Almost surely, 2^3988565 is an apocalyptic number.

3988565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3988565 is a deficient number, since it is larger than the sum of its proper divisors (1551403).

3988565 is a wasteful number, since it uses less digits than its factorization.

3988565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468.

The product of its digits is 259200, while the sum is 44.

The square root of 3988565 is about 1997.1392039615. The cubic root of 3988565 is about 158.5886947316.

The spelling of 3988565 in words is "three million, nine hundred eighty-eight thousand, five hundred sixty-five".