409399 has 4 divisors (see below), whose sum is σ = 413136. Its totient is φ = 405664.

The previous prime is 409397. The next prime is 409429. The reversal of 409399 is 993904.

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

It is a cyclic number.

It is not a de Polignac number, because 409399 - 2¹ = 409397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699 + ... + 1924.

It is an arithmetic number, because the mean of its divisors is an integer number (103284).

2⁴⁰⁹³⁹⁹ is an apocalyptic number.

409399 is a deficient number, since it is larger than the sum of its proper divisors (3737).

409399 is a wasteful number, since it uses less digits than its factorization.

409399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 409399 is about 639.8429494806. The cubic root of 409399 is about 74.2532714419.

It can be divided in two parts, 409 and 399, that added together give a palindrome (808).

The spelling of 409399 in words is "four hundred nine thousand, three hundred ninety-nine".