326405 has 8 divisors (see below), whose sum is σ = 396312. Its totient is φ = 258048.

The previous prime is 326369. The next prime is 326437. The reversal of 326405 is 504623.

It can be written as a sum of positive squares in 4 ways, for example, as 13924 + 312481 = 118^2 + 559^2 .

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 326405 - 2⁸ = 326149 is a prime.

It is a Duffinian number.

It is a Curzon 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 326405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149 + ... + 821.

It is an arithmetic number, because the mean of its divisors is an integer number (49539).

2³²⁶⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

326405 is a deficient number, since it is larger than the sum of its proper divisors (69907).

326405 is an equidigital number, since it uses as much as digits as its factorization.

326405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 326405 is about 571.3186501419. The cubic root of 326405 is about 68.8523764001.

The spelling of 326405 in words is "three hundred twenty-six thousand, four hundred five".