409265 has 4 divisors (see below), whose sum is σ = 491124. Its totient is φ = 327408.

The previous prime is 409261. The next prime is 409267. The reversal of 409265 is 562904.

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 274576 + 134689 = 524^2 + 367^2 .

It is a cyclic number.

It is not a de Polignac number, because 409265 - 2² = 409261 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 409265.

It is not an unprimeable number, because it can be changed into a prime (409261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40922 + ... + 40931.

It is an arithmetic number, because the mean of its divisors is an integer number (122781).

2⁴⁰⁹²⁶⁵ is an apocalyptic number.

It is an amenable number.

409265 is a deficient number, since it is larger than the sum of its proper divisors (81859).

409265 is an equidigital number, since it uses as much as digits as its factorization.

409265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81858.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 409265 is about 639.7382277151. The cubic root of 409265 is about 74.2451693018.

The spelling of 409265 in words is "four hundred nine thousand, two hundred sixty-five".