409001 has 4 divisors (see below), whose sum is σ = 416772. Its totient is φ = 401232.

The previous prime is 408997. The next prime is 409007. The reversal of 409001 is 100904.

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 249001 + 160000 = 499^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 409001 - 2² = 408997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 409001.

It is not an unprimeable number, because it can be changed into a prime (409007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3806 + ... + 3911.

It is an arithmetic number, because the mean of its divisors is an integer number (104193).

2⁴⁰⁹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

409001 is a deficient number, since it is larger than the sum of its proper divisors (7771).

409001 is an equidigital number, since it uses as much as digits as its factorization.

409001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 409001 is about 639.5318600351. The cubic root of 409001 is about 74.2292017008.

Adding to 409001 its reverse (100904), we get a palindrome (509905).

The spelling of 409001 in words is "four hundred nine thousand, one".