3865309 has 8 divisors (see below), whose sum is σ = 4440128. Its totient is φ = 3296160.

The previous prime is 3865289. The next prime is 3865321. The reversal of 3865309 is 9035683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3865309 - 2¹⁹ = 3341021 is a prime.

It is a super-2 number, since 2×3865309² = 29881227330962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169 + ... + 2785.

It is an arithmetic number, because the mean of its divisors is an integer number (555016).

Almost surely, 2^3865309 is an apocalyptic number.

It is an amenable number.

3865309 is a deficient number, since it is larger than the sum of its proper divisors (574819).

3865309 is a wasteful number, since it uses less digits than its factorization.

3865309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 3865309 is about 1966.0389111104. The cubic root of 3865309 is about 156.9379851630.

It can be divided in two parts, 3865 and 309, that multiplied together give a triangular number (1194285 = T₁₅₄₅).

The spelling of 3865309 in words is "three million, eight hundred sixty-five thousand, three hundred nine".