4390385 has 4 divisors (see below), whose sum is σ = 5268468. Its totient is φ = 3512304.

The previous prime is 4390381. The next prime is 4390409. The reversal of 4390385 is 5830934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5830934 = 2 ⋅2915467.

It can be written as a sum of positive squares in 2 ways, for example, as 485809 + 3904576 = 697^2 + 1976^2 .

It is a cyclic number.

It is not a de Polignac number, because 4390385 - 2² = 4390381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4390381) 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, 439034 + ... + 439043.

It is an arithmetic number, because the mean of its divisors is an integer number (1317117).

Almost surely, 2^4390385 is an apocalyptic number.

It is an amenable number.

4390385 is a deficient number, since it is larger than the sum of its proper divisors (878083).

4390385 is an equidigital number, since it uses as much as digits as its factorization.

4390385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878082.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 4390385 is about 2095.3245571987. The cubic root of 4390385 is about 163.7448068590.

The spelling of 4390385 in words is "four million, three hundred ninety thousand, three hundred eighty-five".