4021775 has 12 divisors (see below), whose sum is σ = 5280912. Its totient is φ = 3027840.

The previous prime is 4021769. The next prime is 4021777. The reversal of 4021775 is 5771204.

It is not a de Polignac number, because 4021775 - 2⁸ = 4021519 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4307 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (440076).

Almost surely, 2^4021775 is an apocalyptic number.

4021775 is a deficient number, since it is larger than the sum of its proper divisors (1259137).

4021775 is a wasteful number, since it uses less digits than its factorization.

4021775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9490 (or 9485 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 4021775 is about 2005.4363614934. The cubic root of 4021775 is about 159.0276312355.

Adding to 4021775 its reverse (5771204), we get a palindrome (9792979).

The spelling of 4021775 in words is "four million, twenty-one thousand, seven hundred seventy-five".