3965805 has 12 divisors (see below), whose sum is σ = 6874140. Its totient is φ = 2115072.

The previous prime is 3965789. The next prime is 3965827. The reversal of 3965805 is 5085693.

It can be written as a sum of positive squares in 2 ways, for example, as 1153476 + 2812329 = 1074^2 + 1677^2 .

It is not a de Polignac number, because 3965805 - 2⁴ = 3965789 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3965805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44020 + ... + 44109.

It is an arithmetic number, because the mean of its divisors is an integer number (572845).

Almost surely, 2^3965805 is an apocalyptic number.

It is an amenable number.

3965805 is a deficient number, since it is larger than the sum of its proper divisors (2908335).

3965805 is a wasteful number, since it uses less digits than its factorization.

3965805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88140 (or 88137 counting only the distinct ones).

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

The square root of 3965805 is about 1991.4329012046. The cubic root of 3965805 is about 158.2864668923.

The spelling of 3965805 in words is "three million, nine hundred sixty-five thousand, eight hundred five".