409641 has 4 divisors (see below), whose sum is σ = 546192. Its totient is φ = 273092.

The previous prime is 409639. The next prime is 409657. The reversal of 409641 is 146904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 409641 - 2¹ = 409639 is a prime.

It is a D-number.

409641 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (409691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68271 + ... + 68276.

It is an arithmetic number, because the mean of its divisors is an integer number (136548).

2⁴⁰⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

409641 is a deficient number, since it is larger than the sum of its proper divisors (136551).

409641 is a wasteful number, since it uses less digits than its factorization.

409641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136550.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 409641 is about 640.0320304485. The cubic root of 409641 is about 74.2678991867.

The spelling of 409641 in words is "four hundred nine thousand, six hundred forty-one".