409844 has 6 divisors (see below), whose sum is σ = 717234. Its totient is φ = 204920.

The previous prime is 409841. The next prime is 409861. The reversal of 409844 is 448904.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 169744 = 490^2 + 412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51227 + ... + 51234.

It is an arithmetic number, because the mean of its divisors is an integer number (119539).

2⁴⁰⁹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

409844 is a deficient number, since it is larger than the sum of its proper divisors (307390).

409844 is a wasteful number, since it uses less digits than its factorization.

409844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102465 (or 102463 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 409844 is about 640.1905966195. The cubic root of 409844 is about 74.2801651251.

Subtracting 409844 from its reverse (448904), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 409844 in words is "four hundred nine thousand, eight hundred forty-four".