3509865 has 16 divisors (see below), whose sum is σ = 6240000. Its totient is φ = 1871856.

The previous prime is 3509861. The next prime is 3509873. The reversal of 3509865 is 5689053.

It is not a de Polignac number, because 3509865 - 2² = 3509861 is a prime.

It is a Curzon number.

3509865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3509861) 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, 12865 + ... + 13134.

It is an arithmetic number, because the mean of its divisors is an integer number (390000).

Almost surely, 2^3509865 is an apocalyptic number.

It is an amenable number.

3509865 is a deficient number, since it is larger than the sum of its proper divisors (2730135).

3509865 is a wasteful number, since it uses less digits than its factorization.

3509865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26013 (or 26007 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 3509865 is about 1873.4633703385. The cubic root of 3509865 is about 151.9719621646.

The spelling of 3509865 in words is "three million, five hundred nine thousand, eight hundred sixty-five".