409643 has 4 divisors (see below), whose sum is σ = 441168. Its totient is φ = 378120.

The previous prime is 409639. The next prime is 409657. The reversal of 409643 is 346904.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 409643 - 2² = 409639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (409693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15743 + ... + 15768.

It is an arithmetic number, because the mean of its divisors is an integer number (110292).

2⁴⁰⁹⁶⁴³ is an apocalyptic number.

409643 is a deficient number, since it is larger than the sum of its proper divisors (31525).

409643 is a wasteful number, since it uses less digits than its factorization.

409643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31524.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 409643 is about 640.0335928684. The cubic root of 409643 is about 74.2680200531.

The spelling of 409643 in words is "four hundred nine thousand, six hundred forty-three".