3909965 has 8 divisors (see below), whose sum is σ = 4806648. Its totient is φ = 3051520.

The previous prime is 3909959. The next prime is 3909967. The reversal of 3909965 is 5699093.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 334084 + 3575881 = 578^2 + 1891^2 .

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

It is not a de Polignac number, because 3909965 - 2⁸ = 3909709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9332 + ... + 9741.

It is an arithmetic number, because the mean of its divisors is an integer number (600831).

Almost surely, 2^3909965 is an apocalyptic number.

It is an amenable number.

3909965 is a deficient number, since it is larger than the sum of its proper divisors (896683).

3909965 is a wasteful number, since it uses less digits than its factorization.

3909965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19119.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 3909965 is about 1977.3631431783. The cubic root of 3909965 is about 157.5400418893.

The spelling of 3909965 in words is "three million, nine hundred nine thousand, nine hundred sixty-five".