4081809 has 8 divisors (see below), whose sum is σ = 5558400. Its totient is φ = 2663216.

The previous prime is 4081799. The next prime is 4081811. The reversal of 4081809 is 9081804.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4081809 - 2⁴ = 4081793 is a prime.

It is a super-2 number, since 2×4081809² = 33322329424962, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (4081849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14334 + ... + 14615.

It is an arithmetic number, because the mean of its divisors is an integer number (694800).

Almost surely, 2^4081809 is an apocalyptic number.

It is an amenable number.

4081809 is a deficient number, since it is larger than the sum of its proper divisors (1476591).

4081809 is a wasteful number, since it uses less digits than its factorization.

4081809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28999.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 4081809 is about 2020.3487322737. The cubic root of 4081809 is about 159.8150075478.

The spelling of 4081809 in words is "four million, eighty-one thousand, eight hundred nine".