409945 has 8 divisors (see below), whose sum is σ = 495936. Its totient is φ = 325296.

The previous prime is 409943. The next prime is 409951. The reversal of 409945 is 549904.

It is a happy number.

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 409945 - 2¹ = 409943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564 + ... + 1066.

It is an arithmetic number, because the mean of its divisors is an integer number (61992).

2⁴⁰⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

409945 is a deficient number, since it is larger than the sum of its proper divisors (85991).

409945 is a wasteful number, since it uses less digits than its factorization.

409945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 409945 is about 640.2694745183. The cubic root of 409945 is about 74.2862663737.

The spelling of 409945 in words is "four hundred nine thousand, nine hundred forty-five".