4000385 has 4 divisors (see below), whose sum is σ = 4800468. Its totient is φ = 3200304.

The previous prime is 4000379. The next prime is 4000439. The reversal of 4000385 is 5830004.

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 3094081 + 906304 = 1759^2 + 952^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000385 - 2¹⁶ = 3934849 is a prime.

It is a Duffinian number.

It is a Curzon 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, 400034 + ... + 400043.

It is an arithmetic number, because the mean of its divisors is an integer number (1200117).

Almost surely, 2^4000385 is an apocalyptic number.

It is an amenable number.

4000385 is a deficient number, since it is larger than the sum of its proper divisors (800083).

4000385 is an equidigital number, since it uses as much as digits as its factorization.

4000385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800082.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 4000385 is about 2000.0962476841. The cubic root of 4000385 is about 158.7451979451.

Adding to 4000385 its reverse (5830004), we get a palindrome (9830389).

The spelling of 4000385 in words is "four million, three hundred eighty-five", and thus it is an aban number.