4021385 has 8 divisors (see below), whose sum is σ = 4854600. Its totient is φ = 3197824.

The previous prime is 4021379. The next prime is 4021387. The reversal of 4021385 is 5831204.

It can be written as a sum of positive squares in 4 ways, for example, as 2393209 + 1628176 = 1547^2 + 1276^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4021385 - 2¹⁰ = 4020361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4021385.

It is not an unprimeable number, because it can be changed into a prime (4021387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460 + ... + 3189.

It is an arithmetic number, because the mean of its divisors is an integer number (606825).

Almost surely, 2^4021385 is an apocalyptic number.

It is an amenable number.

4021385 is a deficient number, since it is larger than the sum of its proper divisors (833215).

4021385 is a wasteful number, since it uses less digits than its factorization.

4021385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 4021385 is about 2005.3391234402. The cubic root of 4021385 is about 159.0224906545.

Adding to 4021385 its reverse (5831204), we get a palindrome (9852589).

The spelling of 4021385 in words is "four million, twenty-one thousand, three hundred eighty-five".