409389 has 4 divisors (see below), whose sum is σ = 545856. Its totient is φ = 272924.

The previous prime is 409379. The next prime is 409391. The reversal of 409389 is 983904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 409389 - 2⁷ = 409261 is a prime.

It is a D-number.

It is a plaindrome in base 13.

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 409389.

It is not an unprimeable number, because it can be changed into a prime (409349) 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, 68229 + ... + 68234.

It is an arithmetic number, because the mean of its divisors is an integer number (136464).

2⁴⁰⁹³⁸⁹ is an apocalyptic number.

It is an amenable number.

409389 is a deficient number, since it is larger than the sum of its proper divisors (136467).

409389 is a wasteful number, since it uses less digits than its factorization.

409389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136466.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 409389 is about 639.8351350153. The cubic root of 409389 is about 74.2526668656.

The spelling of 409389 in words is "four hundred nine thousand, three hundred eighty-nine".