3989685 has 16 divisors (see below), whose sum is σ = 7295616. Its totient is φ = 1823808.

The previous prime is 3989683. The next prime is 3989701. The reversal of 3989685 is 5869893.

It is not a de Polignac number, because 3989685 - 2¹ = 3989683 is a prime.

3989685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18894 + ... + 19103.

It is an arithmetic number, because the mean of its divisors is an integer number (455976).

Almost surely, 2^3989685 is an apocalyptic number.

3989685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3989685 is a deficient number, since it is larger than the sum of its proper divisors (3305931).

3989685 is a wasteful number, since it uses less digits than its factorization.

3989685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38012.

The product of its digits is 466560, while the sum is 48.

The square root of 3989685 is about 1997.4195853651. The cubic root of 3989685 is about 158.6035373893.

The spelling of 3989685 in words is "three million, nine hundred eighty-nine thousand, six hundred eighty-five".