4128185 has 4 divisors (see below), whose sum is σ = 4953828. Its totient is φ = 3302544.

The previous prime is 4128181. The next prime is 4128193. The reversal of 4128185 is 5818214.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5818214 = 2 ⋅2909107.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 3701776 = 653^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 4128185 - 2² = 4128181 is a prime.

It is a super-2 number, since 2×4128185² = 34083822788450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4128181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412814 + ... + 412823.

It is an arithmetic number, because the mean of its divisors is an integer number (1238457).

Almost surely, 2^4128185 is an apocalyptic number.

It is an amenable number.

4128185 is a deficient number, since it is larger than the sum of its proper divisors (825643).

4128185 is an equidigital number, since it uses as much as digits as its factorization.

4128185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825642.

The product of its digits is 2560, while the sum is 29.

The square root of 4128185 is about 2031.7935426613. The cubic root of 4128185 is about 160.4179826357.

Adding to 4128185 its sum of digits (29), we get a palindrome (4128214).

The spelling of 4128185 in words is "four million, one hundred twenty-eight thousand, one hundred eighty-five".