3963965 has 4 divisors (see below), whose sum is σ = 4756764. Its totient is φ = 3171168.

The previous prime is 3963959. The next prime is 3963977. The reversal of 3963965 is 5693693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5693693 = 193 ⋅29501.

It can be written as a sum of positive squares in 2 ways, for example, as 1026169 + 2937796 = 1013^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 3963965 - 2⁸ = 3963709 is a prime.

It is a Duffinian number.

It is a congruent 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, 396392 + ... + 396401.

It is an arithmetic number, because the mean of its divisors is an integer number (1189191).

Almost surely, 2^3963965 is an apocalyptic number.

It is an amenable number.

3963965 is a deficient number, since it is larger than the sum of its proper divisors (792799).

3963965 is an equidigital number, since it uses as much as digits as its factorization.

3963965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792798.

The product of its digits is 131220, while the sum is 41.

The square root of 3963965 is about 1990.9708686970. The cubic root of 3963965 is about 158.2619832415.

The spelling of 3963965 in words is "three million, nine hundred sixty-three thousand, nine hundred sixty-five".