3609985 has 4 divisors (see below), whose sum is σ = 4331988. Its totient is φ = 2887984.

The previous prime is 3609973. The next prime is 3609997. The reversal of 3609985 is 5899063.

3609985 = 1343² + 1344².

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

It is an interprime number because it is at equal distance from previous prime (3609973) and next prime (3609997).

It can be written as a sum of positive squares in 2 ways, for example, as 1803649 + 1806336 = 1343^2 + 1344^2 .

It is a cyclic number.

It is not a de Polignac number, because 3609985 - 2⁵ = 3609953 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3609985 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360994 + ... + 361003.

It is an arithmetic number, because the mean of its divisors is an integer number (1082997).

Almost surely, 2^3609985 is an apocalyptic number.

3609985 is the 1344-th centered square number.

It is an amenable number.

3609985 is a deficient number, since it is larger than the sum of its proper divisors (722003).

3609985 is an equidigital number, since it uses as much as digits as its factorization.

3609985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722002.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 3609985 is about 1899.9960526275. The cubic root of 3609985 is about 153.4034519671.

The spelling of 3609985 in words is "three million, six hundred nine thousand, nine hundred eighty-five".