3930865 has 4 divisors (see below), whose sum is σ = 4717044. Its totient is φ = 3144688.

The previous prime is 3930841. The next prime is 3930869. The reversal of 3930865 is 5680393.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 1787569 = 1464^2 + 1337^2 .

It is a cyclic number.

It is not a de Polignac number, because 3930865 - 2⁷ = 3930737 is a prime.

It is a Duffinian number.

3930865 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3930865.

It is not an unprimeable number, because it can be changed into a prime (3930869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393082 + ... + 393091.

It is an arithmetic number, because the mean of its divisors is an integer number (1179261).

Almost surely, 2^3930865 is an apocalyptic number.

It is an amenable number.

3930865 is a deficient number, since it is larger than the sum of its proper divisors (786179).

3930865 is an equidigital number, since it uses as much as digits as its factorization.

3930865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786178.

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

The square root of 3930865 is about 1982.6409155467. The cubic root of 3930865 is about 157.8202436811.

The spelling of 3930865 in words is "three million, nine hundred thirty thousand, eight hundred sixty-five".