3809865 has 16 divisors (see below), whose sum is σ = 6120000. Its totient is φ = 2023872.

The previous prime is 3809857. The next prime is 3809891. The reversal of 3809865 is 5689083.

It is not a de Polignac number, because 3809865 - 2³ = 3809857 is a prime.

It is a d-powerful number, because it can be written as 3⁵ + 8⁵ + 0 + 9² + 8⁷ + 6⁸ + 5 .

3809865 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7231 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (382500).

Almost surely, 2^3809865 is an apocalyptic number.

It is an amenable number.

3809865 is a deficient number, since it is larger than the sum of its proper divisors (2310135).

3809865 is a wasteful number, since it uses less digits than its factorization.

3809865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 3809865 is about 1951.8875479904. The cubic root of 3809865 is about 156.1839955885.

The spelling of 3809865 in words is "three million, eight hundred nine thousand, eight hundred sixty-five".