3943665 has 48 divisors (see below), whose sum is σ = 7727616. Its totient is φ = 1843200.

The previous prime is 3943663. The next prime is 3943673. The reversal of 3943665 is 5663493.

It is not a de Polignac number, because 3943665 - 2¹ = 3943663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15217 + ... + 15473.

It is an arithmetic number, because the mean of its divisors is an integer number (160992).

Almost surely, 2^3943665 is an apocalyptic number.

It is an amenable number.

3943665 is a deficient number, since it is larger than the sum of its proper divisors (3783951).

3943665 is a wasteful number, since it uses less digits than its factorization.

3943665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 307 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 3943665 is about 1985.8663096996. The cubic root of 3943665 is about 157.9913604206.

It can be divided in two parts, 39 and 43665, that multiplied together give a triangular number (1702935 = T₁₈₄₅).

The spelling of 3943665 in words is "three million, nine hundred forty-three thousand, six hundred sixty-five".