4390865 has 4 divisors (see below), whose sum is σ = 5269044. Its totient is φ = 3512688.

The previous prime is 4390849. The next prime is 4390873. The reversal of 4390865 is 5680934.

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 2835856 + 1555009 = 1684^2 + 1247^2 .

It is a cyclic number.

It is not a de Polignac number, because 4390865 - 2⁴ = 4390849 is a prime.

It is a Duffinian 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, 439082 + ... + 439091.

It is an arithmetic number, because the mean of its divisors is an integer number (1317261).

Almost surely, 2^4390865 is an apocalyptic number.

It is an amenable number.

4390865 is a deficient number, since it is larger than the sum of its proper divisors (878179).

4390865 is an equidigital number, since it uses as much as digits as its factorization.

4390865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878178.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 4390865 is about 2095.4390947961. The cubic root of 4390865 is about 163.7507740383.

The spelling of 4390865 in words is "four million, three hundred ninety thousand, eight hundred sixty-five".