409345 has 4 divisors (see below), whose sum is σ = 491220. Its totient is φ = 327472.

The previous prime is 409337. The next prime is 409349. The reversal of 409345 is 543904.

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 167281 + 242064 = 409^2 + 492^2 .

It is a cyclic number.

It is not a de Polignac number, because 409345 - 2³ = 409337 is a prime.

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, 40930 + ... + 40939.

It is an arithmetic number, because the mean of its divisors is an integer number (122805).

2⁴⁰⁹³⁴⁵ is an apocalyptic number.

It is an amenable number.

409345 is a deficient number, since it is larger than the sum of its proper divisors (81875).

409345 is an equidigital number, since it uses as much as digits as its factorization.

409345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81874.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 409345 is about 639.8007502340. The cubic root of 409345 is about 74.2500066131.

The spelling of 409345 in words is "four hundred nine thousand, three hundred forty-five".