4011809 has 4 divisors (see below), whose sum is σ = 4109700. Its totient is φ = 3913920.

The previous prime is 4011797. The next prime is 4011811. The reversal of 4011809 is 9081104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1677025 + 2334784 = 1295^2 + 1528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4011809 is a prime.

It is a super-2 number, since 2×4011809² = 32189222904962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4011859) 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, 48884 + ... + 48965.

It is an arithmetic number, because the mean of its divisors is an integer number (1027425).

Almost surely, 2^4011809 is an apocalyptic number.

It is an amenable number.

4011809 is a deficient number, since it is larger than the sum of its proper divisors (97891).

4011809 is an equidigital number, since it uses as much as digits as its factorization.

4011809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97890.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 4011809 is about 2002.9500742655. The cubic root of 4011809 is about 158.8961652132.

The spelling of 4011809 in words is "four million, eleven thousand, eight hundred nine".