321409 has 8 divisors (see below), whose sum is σ = 357120. Its totient is φ = 286800.

The previous prime is 321403. The next prime is 321413. The reversal of 321409 is 904123.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321403) 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, 432 + ... + 910.

It is an arithmetic number, because the mean of its divisors is an integer number (44640).

2³²¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

321409 is a deficient number, since it is larger than the sum of its proper divisors (35711).

321409 is a wasteful number, since it uses less digits than its factorization.

321409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 321409 is about 566.9294488735. The cubic root of 321409 is about 68.4992807213.

It can be divided in two parts, 32 and 1409, that added together give a palindrome (1441).

The spelling of 321409 in words is "three hundred twenty-one thousand, four hundred nine".