409145 has 16 divisors (see below), whose sum is σ = 551232. Its totient is φ = 288960.

The previous prime is 409121. The next prime is 409153. The reversal of 409145 is 541904.

It is a happy number.

It is not a de Polignac number, because 409145 - 2⁶ = 409081 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 409145.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2279 + ... + 2451.

It is an arithmetic number, because the mean of its divisors is an integer number (34452).

2⁴⁰⁹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

409145 is a deficient number, since it is larger than the sum of its proper divisors (142087).

409145 is a wasteful number, since it uses less digits than its factorization.

409145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 409145 is about 639.6444324779. The cubic root of 409145 is about 74.2379121528.

The spelling of 409145 in words is "four hundred nine thousand, one hundred forty-five".