4378865 has 4 divisors (see below), whose sum is σ = 5254644. Its totient is φ = 3503088.

The previous prime is 4378837. The next prime is 4378897. The reversal of 4378865 is 5688734.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5688734 = 2 ⋅2844367.

It can be written as a sum of positive squares in 2 ways, for example, as 1478656 + 2900209 = 1216^2 + 1703^2 .

It is a cyclic number.

It is not a de Polignac number, because 4378865 - 2⁸ = 4378609 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, 437882 + ... + 437891.

It is an arithmetic number, because the mean of its divisors is an integer number (1313661).

Almost surely, 2^4378865 is an apocalyptic number.

It is an amenable number.

4378865 is a deficient number, since it is larger than the sum of its proper divisors (875779).

4378865 is an equidigital number, since it uses as much as digits as its factorization.

4378865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875778.

The product of its digits is 161280, while the sum is 41.

The square root of 4378865 is about 2092.5737740878. The cubic root of 4378865 is about 163.6014638910.

The spelling of 4378865 in words is "four million, three hundred seventy-eight thousand, eight hundred sixty-five".