4019805 has 12 divisors (see below), whose sum is σ = 6967740. Its totient is φ = 2143872.

The previous prime is 4019797. The next prime is 4019809. The reversal of 4019805 is 5089104.

It can be written as a sum of positive squares in 2 ways, for example, as 2643876 + 1375929 = 1626^2 + 1173^2 .

It is not a de Polignac number, because 4019805 - 2³ = 4019797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4019809) 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, 44620 + ... + 44709.

It is an arithmetic number, because the mean of its divisors is an integer number (580645).

Almost surely, 2^4019805 is an apocalyptic number.

4019805 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4019805 is a deficient number, since it is larger than the sum of its proper divisors (2947935).

4019805 is a wasteful number, since it uses less digits than its factorization.

4019805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89340 (or 89337 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 4019805 is about 2004.9451364065. The cubic root of 4019805 is about 159.0016613093.

The spelling of 4019805 in words is "four million, nineteen thousand, eight hundred five".