3688985 has 4 divisors (see below), whose sum is σ = 4426788. Its totient is φ = 2951184.

The previous prime is 3688981. The next prime is 3688991. The reversal of 3688985 is 5898863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5898863 = 947 ⋅6229.

It can be written as a sum of positive squares in 2 ways, for example, as 495616 + 3193369 = 704^2 + 1787^2 .

It is a cyclic number.

It is not a de Polignac number, because 3688985 - 2² = 3688981 is a prime.

It is a super-2 number, since 2×3688985² = 27217220660450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3688981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368894 + ... + 368903.

It is an arithmetic number, because the mean of its divisors is an integer number (1106697).

Almost surely, 2^3688985 is an apocalyptic number.

It is an amenable number.

3688985 is a deficient number, since it is larger than the sum of its proper divisors (737803).

3688985 is an equidigital number, since it uses as much as digits as its factorization.

3688985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737802.

The product of its digits is 414720, while the sum is 47.

The square root of 3688985 is about 1920.6730591124. The cubic root of 3688985 is about 154.5144011740.

The spelling of 3688985 in words is "three million, six hundred eighty-eight thousand, nine hundred eighty-five".