4020385 has 4 divisors (see below), whose sum is σ = 4824468. Its totient is φ = 3216304.

The previous prime is 4020361. The next prime is 4020407. The reversal of 4020385 is 5830204.

4020385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1697809 + 2322576 = 1303^2 + 1524^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020385 - 2⁵ = 4020353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402034 + ... + 402043.

It is an arithmetic number, because the mean of its divisors is an integer number (1206117).

Almost surely, 2^4020385 is an apocalyptic number.

It is an amenable number.

4020385 is a deficient number, since it is larger than the sum of its proper divisors (804083).

4020385 is an equidigital number, since it uses as much as digits as its factorization.

4020385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804082.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 4020385 is about 2005.0897735513. The cubic root of 4020385 is about 159.0093081586.

Adding to 4020385 its reverse (5830204), we get a palindrome (9850589).

The spelling of 4020385 in words is "four million, twenty thousand, three hundred eighty-five".