4185409 has 2 divisors, whose sum is σ = 4185410. Its totient is φ = 4185408.

The previous prime is 4185373. The next prime is 4185413. The reversal of 4185409 is 9045814.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 2039184 = 1465^2 + 1428^2 .

It is a cyclic number.

It is not a de Polignac number, because 4185409 - 2⁹ = 4184897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4185439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2092704 + 2092705.

It is an arithmetic number, because the mean of its divisors is an integer number (2092705).

Almost surely, 2^4185409 is an apocalyptic number.

It is an amenable number.

4185409 is a deficient number, since it is larger than the sum of its proper divisors (1).

4185409 is an equidigital number, since it uses as much as digits as its factorization.

4185409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 4185409 is about 2045.8272165557. The cubic root of 4185409 is about 161.1558102248.

The spelling of 4185409 in words is "four million, one hundred eighty-five thousand, four hundred nine".