4180805 has 4 divisors (see below), whose sum is σ = 5016972. Its totient is φ = 3344640.

The previous prime is 4180801. The next prime is 4180819. The reversal of 4180805 is 5080814.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5080814 = 2 ⋅2540407.

It can be written as a sum of positive squares in 2 ways, for example, as 857476 + 3323329 = 926^2 + 1823^2 .

It is not a de Polignac number, because 4180805 - 2² = 4180801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4180801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418076 + ... + 418085.

It is an arithmetic number, because the mean of its divisors is an integer number (1254243).

Almost surely, 2^4180805 is an apocalyptic number.

It is an amenable number.

4180805 is a deficient number, since it is larger than the sum of its proper divisors (836167).

4180805 is an equidigital number, since it uses as much as digits as its factorization.

4180805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836166.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 4180805 is about 2044.7016897337. The cubic root of 4180805 is about 161.0966974378.

Subtracting 4180805 from its reverse (5080814), we obtain a palindrome (900009).

The spelling of 4180805 in words is "four million, one hundred eighty thousand, eight hundred five".